Palmer, Vance
Melbourne University Press, 1940
Buku Teks
Phaidon Press, 1945
Buku Referensi
edited by Gregory A. Kimble, Michael Wertheimer, Charlotte White
American Psychological Association, 1991
Buku Teks
Stewart, Ian Charles
Pranawajati, 1990
Buku Referensi
Miller, Louise
VGM Career Horizons, 1995
Buku Teks