Huxley, Julian, compiler
A Mentor Book, 1957
Buku Teks
Sarton, George
George Braziller, Inc., 1956
Buku Teks
Perry, Ralph Barton
George Braziller, Inc., 1956
Buku Teks
Gorbachev, Mikhail, author
I.B. Tauris, 2005
Buku Teks
Oxford University Press, 1990
Buku Referensi