Daniel, Pope, author
Basic Books, 1983
Buku Teks
Friedman, Alice T., author
Abrams, 1998
Buku Teks
Radford, K.J., author
Phoenix Press, 1981
Buku Teks
edited by Sidney Mailick; The United Nations Institute for Training and Research
Anchor Press, 1974
Buku Teks
Merken, Melvin, author
Saunders College Publishing, 1993
Buku Teks