\documentclass[a4paper]{article}

% math
\usepackage{amsmath}
% figures
\usepackage{adjustbox}
\usepackage{float}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{subcaption}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9} 

% circuits
\usepackage{pst-circ}

% foonotes
\usepackage[bottom]{footmisc}
% tables
\usepackage{booktabs}
\usepackage{array}
% language
\usepackage[italian]{babel}
% encoding / fonts
\usepackage[T1]{fontenc}
% urls
\usepackage{url}

\title{Hardware e Software}
\author{Naoki Pross}

% custom macros
\newcommand{\placeholderfig}[1]{%
	\includegraphics[width=.6\textwidth]{res/placeholder}
	\message{Placeholder figure #1}
}

\begin{document}
\maketitle
\break
\tableofcontents
% \listoffigures

\include{tex/memorie}
\include{tex/circuiti_digitali}
\include{tex/convertitori}
\include{tex/trasmissione_seriale}

\begin{thebibliography}{9}
	\bibitem{petrini1} Elettronica: Componenti digitali e programmabili, 
		{\it E. Cuniberti e L. De Lucchi}, Petrini 2008

	% trasmissione seriale
	\bibitem{ferrigno} I bus di comunicazione seriale, {\it Luigi Ferrigno}, \\
	\url{http://webuser.unicas.it/misure/MAQ_270/USB/SERIALE%20ED%20USB.pdf}

	\bibitem{wiki:usb} 
	USB. (2017, November 25). {\it Wikipedia, The Free Encyclopedia},  \\
	\url{https://en.wikipedia.org/w/index.php?title=USB&oldid=812045888}

\end{thebibliography}

% \include{tex/cc-license}

\end{document}