Wicks, Rollo E.
N.Y. State Univ. of New York , 1958
Buku Teks
Larue, Gerald A.
Prentice-Hall, 1975
Buku Teks
Jung, C.G. (Carl Gustav), 1875-1961, author
Kegan Paul, 1933
Buku Teks
editor in chief Richard Cavendish
New York Marshall Cavendish 1983
Buku Referensi
Haas, Francis J.
Buku Teks