Beckhard, Arthur, author
G.P. Putnam`s Sons, 1959
Buku Teks
Einstein, Albert, 1879-1955, author
Simon and Schuster, 1967
Buku Teks
Running Press, 2007
Buku Teks
Potgieter E. J.
W.E.J Tjeenk Willink, 1914
Buku Teks
Strathern, Paul
Jakarta : Erlangga, 2003,
Buku Teks