diff --git a/luku01.tex b/luku01.tex
index 9d95555..000782f 100644
--- a/luku01.tex
+++ b/luku01.tex
@@ -875,8 +875,11 @@ and the Asia-Pacific Informatics Olympiad (APIO).
 
 Some countries organize online practice contests
 for future IOI participants,
-such as the Croatian Open Competition in Informatics (COCI) \cite{coci}
-and the USA Computing Olympiad (USACO) \cite{usaco}.
+such as the Croatian Open Competition in Informatics (COCI)
+and the USA Computing Olympiad (USACO).
+In addition,
+many problems from Polish contests
+are available online \cite{main}.
 
 \subsubsection{ICPC}
 
@@ -921,4 +924,37 @@ Google Code Jam and Yandex.Algorithm.
 Of course, companies also use those contests for recruiting:
 performing well in a contest is a good way to prove one's skills.
 
-\section{Resources}
\ No newline at end of file
+\section{Books}
+
+\subsubsection{Competitive programming books}
+
+There are already some books (besides this book) that
+concentrate on competitive programming and algorithmic problem solving:
+
+\begin{itemize}
+\item S. Halim and F. Halim:
+\emph{Competitive Programming 3: The New Lower Bound of Programming Contests}, 2013
+\item S. S. Skiena and M. A. Revilla:
+\emph{Programming Challenges: The Programming Contest Training Manual},
+Springer, 2003
+\item \emph{Looking for a Challenge? The Ultimate Problem Set from
+the University of Warsaw Programming Competitions}, 2012
+\end{itemize}
+
+The first two books are intended for beginners,
+whereas the last book contains advanced material.
+
+\subsubsection{General algorithm books}
+
+Of course, general algorithm books are also suitable for
+competitive programmers.
+Some good books are:
+
+\begin{itemize}
+\item T. H. Cormen, C. E. Leiserson, R. L. Rivest and C. Stein:
+\emph{Introduction to Algorithms}, MIT Press, 2009 (3rd edition)
+\item J. Kleinberg and É. Tardos:
+\emph{Algorithm Design}, Pearson, 2005
+\item S. S. Skiena:
+\emph{The Algorithm Design Manual}, Springer, 2008 (2nd edition)
+\end{itemize}