Guth, Hans P., author
Wadsworth, 1969
Buku Teks
Cummings, Jack
Prentice-Hall, 1997
Buku Teks
Pritchard, John, author
Viking, 1992
Buku Referensi
edited by George A. Hawkins
McGraw-Hill, 1968
Buku Teks
cordinating editor, Geoge A. Hawkins
McGraw-Hill, 1968
Buku Teks