Greif, Edwin Charles
Prentice-Hall, 1958
Buku Teks
Fournies, Ferdinand, author
McGraw-Hill, 2003
Buku Teks
Carlin, Gabriel S.
Prentice-Hall, 1962
Buku Teks
Broughton, Philip Delves, author
The Penguin Press, 2012
Buku Teks
Bettger, Frank
Gramedia Pustaka Utama, 1991
Buku Teks