\begin{thebibliography}{1}

\bibitem{McCullagh1977}
James~C. McCullagh, David~Gordon Wilson, Stuart~S. Wilson, John McGeorge, Mark
  Blossom, and Diana Branch.
\newblock {\em Pedal Power: In Work, Leisure, and Transportation}.
\newblock Rodale Press, Emmaus, PA, 1977.

\bibitem{Wilson1986}
David~Gordon Wilson.
\newblock Understanding pedal power.
\newblock Technical report, Volunteers in Technical Assistance, 1986.

\bibitem{Wilson2004}
D.~G. Wilson and Jim Papadopoulos.
\newblock {\em Bicycling Science}.
\newblock MIT Press, 3rd edition, 2004.

\bibitem{Dean2008}
Tamara Dean.
\newblock {\em The Human-Powered Home: Choosing Muscles Over Motors}.
\newblock New Society Publishers, 2008.

\bibitem{Jansen2011}
Arjen Jansen.
\newblock {\em Human Power: Empirically Explored}.
\newblock PhD thesis, Delft University of Technology, 2011.

\end{thebibliography}
