diff --git a/app/controllers/authors_controller.rb b/app/controllers/authors_controller.rb
index 1c0ec9f..dd919ce 100644
--- a/app/controllers/authors_controller.rb
+++ b/app/controllers/authors_controller.rb
@@ -1,4 +1,7 @@
 class AuthorsController < ApplicationController
+	include PreferencesHelper
+
+	before_action :preferences, only: :index
 
 	def show
 		@author = Author.find(params[:id])
@@ -6,7 +9,8 @@ class AuthorsController < ApplicationController
 	end
 
 	def index
-		@authors = Author.paginate(page: params[:page])
+		@authors = Author.where(initial_filter).order(:sort)
+			.paginate(page: params[:page], per_page: session[:current_per_page])
 		@title = "Authors"
 		respond_to do |format|
 			format.html 
diff --git a/app/controllers/books_controller.rb b/app/controllers/books_controller.rb
index 5081477..6a4cb72 100644
--- a/app/controllers/books_controller.rb
+++ b/app/controllers/books_controller.rb
@@ -1,4 +1,7 @@
 class BooksController < ApplicationController
+	include PreferencesHelper
+
+	before_action :preferences, only: :index
 
 	def show
 		@book = Book.find(params[:id])
@@ -6,7 +9,8 @@ class BooksController < ApplicationController
 	end
 
 	def index
-		@books = Book.paginate(page: params[:page])
+		@books = Book.where(initial_filter).order(:sort)
+			.paginate(page: params[:page], per_page: session[:current_per_page])
 		@title = "Books"
 		respond_to do |format|
 			format.html 
diff --git a/app/controllers/series_controller.rb b/app/controllers/series_controller.rb
index a8bdbf7..7dd91ee 100644
--- a/app/controllers/series_controller.rb
+++ b/app/controllers/series_controller.rb
@@ -1,4 +1,7 @@
 class SeriesController < ApplicationController
+	include PreferencesHelper
+
+	before_action :preferences, only: :index
 
 	def show
 		@serie = Serie.find(params[:id])
@@ -6,7 +9,8 @@ class SeriesController < ApplicationController
 	end
 
 	def index
-		@series = Serie.paginate(page: params[:page])
+		@series = Serie.where(initial_filter).order(:sort)
+			.paginate(page: params[:page], per_page: session[:current_per_page])
 		@title = "Series"
 		respond_to do |format|
 			format.html 
diff --git a/app/helpers/preferences_helper.rb b/app/helpers/preferences_helper.rb
new file mode 100644
index 0000000..fc7863e
--- /dev/null
+++ b/app/helpers/preferences_helper.rb
@@ -0,0 +1,16 @@
+module PreferencesHelper
+
+	# filter data on first letter
+	def initial_filter
+		["UPPER(sort) LIKE ?", session[:initial] + "%"] if session[:initial]
+	end
+
+	# update preferences (per_page, initial)
+	def preferences
+		session[:current_per_page] = params[:per_page] ? params[:per_page].to_i : (session[:current_per_page] || WillPaginate.per_page)
+		if params[:initial] 
+			session[:initial] = (session[:initial] == params[:initial] ? nil : params[:initial])
+		end
+	end
+
+end
diff --git a/app/views/authors/_index.html.erb b/app/views/authors/_index.html.erb
index e1da93b..2033cd3 100644
--- a/app/views/authors/_index.html.erb
+++ b/app/views/authors/_index.html.erb
@@ -1,3 +1,4 @@
+<%= render 'layouts/initials' %>
 <%= will_paginate class: "center" %>
 
 <table class="table table-striped authors">
@@ -14,3 +15,4 @@
 </table>
 
 <%= will_paginate class: "center" %>
+<%= render 'layouts/perpage' %>
diff --git a/app/views/books/_index.html.erb b/app/views/books/_index.html.erb
index e1ce4f2..7f3a25b 100644
--- a/app/views/books/_index.html.erb
+++ b/app/views/books/_index.html.erb
@@ -1,3 +1,4 @@
+<%= render'layouts/initials' %>
 <%= will_paginate class: "center" %>
 
 <table class="table table-striped authors">
@@ -25,3 +26,4 @@
 </table>
 
 <%= will_paginate class: "center" %>
+<%= render'layouts/perpage' %>
diff --git a/app/views/layouts/_initials.html.erb b/app/views/layouts/_initials.html.erb
new file mode 100644
index 0000000..0c8a176
--- /dev/null
+++ b/app/views/layouts/_initials.html.erb
@@ -0,0 +1,10 @@
+<% initials = ['0'] + ('A'..'Z').to_a %>
+<div class="center">
+	<ul class="pagination">
+<% initials.each do |i| %>
+	<%= content_tag :li, class: (i == session[:initial] ? "active": nil) do %>
+		<%= link_to i, url_for(initial: i), remote: true %>
+	<% end %>
+<% end %>
+	</ul>
+</div>
diff --git a/app/views/layouts/_perpage.html.erb b/app/views/layouts/_perpage.html.erb
new file mode 100644
index 0000000..833d166
--- /dev/null
+++ b/app/views/layouts/_perpage.html.erb
@@ -0,0 +1,9 @@
+<div class="center">
+	<ul class="pagination">
+<% [10,20,50,100].each do |p| %>
+	<%= content_tag :li, class: (p == session[:current_per_page] ? "active": nil) do %>
+		<%= link_to p, url_for(per_page: p), remote: true %>
+	<% end %>
+<% end %>
+	</ul>
+</div>
diff --git a/app/views/series/_index.html.erb b/app/views/series/_index.html.erb
index f5d8e5d..2da12c4 100644
--- a/app/views/series/_index.html.erb
+++ b/app/views/series/_index.html.erb
@@ -1,3 +1,4 @@
+<%= render'layouts/initials' %>
 <%= will_paginate class: "center" %>
 
 <table class="table table-striped series">
@@ -31,3 +32,4 @@
 </table>
 
 <%= will_paginate class: "center" %>
+<%= render'layouts/perpage' %>
diff --git a/config/application.rb b/config/application.rb
index 2e5e95c..ec9cbb5 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -22,5 +22,7 @@ module BouquinsRor
 
     # Do not swallow errors in after_commit/after_rollback callbacks.
     config.active_record.raise_in_transactional_callbacks = true
+
+	config.web_console.whitelisted_ips = '10.8.0.0/24'
   end
 end