\begin{itemlist}
\item Hagemans, Rob. 2020. ``PC-BASIC Documentation.'' Updated 2020-09-26 19:20:45. \url{https://robhagemans.github.io/pcbasic/doc/2.0/}.
\item Ahl, David H and North, Steve. 1978. \emph{BASIC Computer Games}. Microcomputer Edition. New York: Workman Pub.
\end{itemlist}