diff --git a/slides/config/preamble.tex b/slides/config/preamble.tex
index 9be5b2a383a9457f4c7aaba08ac3570c40fa1eae..9b336e0a6f43f91b3b663697292e8ce3b318799c 100644
--- a/slides/config/preamble.tex
+++ b/slides/config/preamble.tex
@@ -30,8 +30,6 @@
 \usepackage{setspace}
 \usepackage{xspace}
 
-\usepackage{biblatex}
-
 \setlength{\parindent}{0pt}
 \setlength{\parskip}{6pt plus 2pt minus 1pt}
 \setlength{\emergencystretch}{3em}  % prevent overfull lines
@@ -39,6 +37,18 @@
   \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
 \setcounter{secnumdepth}{0}
 
+%-----------------------------------------------------------------------
+% Bibliography.
+
+\usepackage[backend=biber, style=authoryear, citestyle=authoryear, doi=false, isbn=false, url=false]{biblatex}
+% Use:
+%   \cite{<ref>}
+%   \parencite{<ref>}
+%   \fullcite{<ref>}
+%   \footfullcite{<ref>}
+% ATTENTION: Compilation = pdflatex > biber > pdflatex > pdflatex.
+% Call refs.bib at preamble with: \addbibresource{refs.bib}
+
 %-----------------------------------------------------------------------
 
 \usepackage[hang]{caption}
diff --git a/slides/config/refs.bib b/slides/config/refs.bib
index a0dc84b4ffa1e3b1fb24c71d7d0b325acf506252..4f43e63d6aa993432b6e3847a13ce9a59c8e23a2 100644
--- a/slides/config/refs.bib
+++ b/slides/config/refs.bib
@@ -6,3 +6,12 @@
   year={2016},
   publisher={O'Reilly Media}
 }
+
+@book{ferreira2013estcompjava,
+  title={Estatística Computational em {Java}},
+  author={Ferreira, D. F.},
+  isbn={9788581270135},
+  url={http://www.livraria.editora.ufla.br/estatistica-computacional-em-java.html},
+  year={2013},
+  publisher={Editora UFLA}
+}