Bardwick, Judith M., author
American Management Association, 2008
eBooks
Bloland, Harland G., author
McGraw-Hill, 1974
Buku Teks
edited by Curtiss P. Hansen and Kelley A. Conrad
Quorum Books , 1991
Buku Referensi
American Psychological Association, 1994
Buku Teks
American Psychological Association, 2001
Buku Teks