LaTeX: Formats the Appendix to the form of: A.1, B.1, B.2.1

appendix.tex

\documentclass{book}
\usepackage[toc,title,page]{appendix}

\begin{document}

\tableofcontents

\appendix
\renewcommand{\thesection}{\Alph{section}.\arabic{section}}
\setcounter{section}{0}

\begin{appendices}

\section{Some title}
Some text
\section{bla title}
Some text
\subsection{foo title}
Some text

\end{appendices}

\end{document}