De Chiara, Joseph, 1929-, author
McGraw-Hill, 1978
Buku Teks
Billings, Keith H., author
Van Nostrand Reinhold, 1993
Buku Referensi
Williams, Edward A.
McGraw-Hill, 1983
Buku Teks
Walker, Theodore D., author
John Wiley & Sons, 1991
Buku Teks
Anita Widiastuti, author
Fakultas Psikologi Universitas Indonesia, 2014
UI - Tesis Membership