Porteous, J. Douglas
Addison-Wesley, 1977
Buku Teks
Gist, Noel P., author
Thomas Y. Crowell, 1956
Buku Teks
Mercer, Charles, author
Penguin Books, 1975
Buku Teks
Gist, Noel P., author
Harper & Row , 1974
Buku Teks
Allen L. Hammond [and others]
Oxford University Press , 1996
Buku Teks