Gardner, John W.
Harper colophon books, 1962
Buku Teks
Gardner, John W., author
Yayasan Obor Indonesia, 1994
Buku Teks
Cohen, William A.
Prentice-Hall, 1990
Buku Teks
Adair, John, author
Gramedia Pustaka Utama, 1995
Buku Teks
Tawney, R.H., author
George Allen and Unwin, 1952
Buku Teks