Borden, Neil H., author
Harvard University, 1968
Buku Teks
Fulmer, Robert M., author
Macmillan, 1974
Buku Teks
Fulmer, Robert M., author
Macmillan, 1978
Buku Teks
Rosenau, Milton D., Jr, author
Lifetime Learning, 1982
Buku Teks
Kuczmarski, Thomas D., author
Prentice-Hall, 1988
Buku Teks