\begin{thebibliography}{1}

\bibitem{Cohen}
I.~Bernard Cohen and Anne Whitman.
\newblock {\em Isaac Newton:The Principia (Mathematical Principles of Natural
  Philosophy), A new translation}.
\newblock Univ. of California Press, 1999.
\newblock Translation from the Latin by I. Bernard Cohen and Anne Whitman of
  \textit{\foreignlanguage{latin}{Philosophiae Naturalis Principia
  Mathematica}} (1687, 1713, 1726).

\bibitem{Kepler}
Johannes Kepler.
\newblock {\em \foreignlanguage{latin}{Nova stereometria doliorum vinariorum}}.
\newblock Linz, 1615.
\newblock A selection from this appears in \cite[pp. 192-7]{Struik:Sourcebook}.

\bibitem{Struik:Sourcebook}
Dirk~J. Struik.
\newblock {\em A Source Book in Mathematics, 1200-1800}.
\newblock Harvard Univ. Press, 1969.

\end{thebibliography}