edited by Gregory A. Kimble, Michael Wertheimer, Charlotte White
American Psychological Association, 1991
Buku Teks
Beek, Leo, author
Van Gorcum, 1985
Buku Referensi
Berndt, Catherine H., author
Pitman, 1983
Buku Teks
Wolferen, Karel van
Charles E. Tuttle Company, 1993
Buku Teks
Little, Brown & Co., 1982
Buku Teks