Reshetar, John S.
Frederick A. Praeger, 1962
Buku Teks
Purcell, Victor, 1896-1965, author
Victor Gollancz, 1954
Buku Teks
edited by A. Doak Barnett
Frederick A. Preager, 1963
Buku Teks
Borkenau, Franz
University of Michigan Press, 1962
Buku Teks
Schwarz, Fred
Prentice-Hall, 1961
Buku Teks