edited by Linda L. Sperry and Patricia A. Smiley
Jossey-Bass, 1995
Buku Teks SO
Glenn, H. Stephen, author
Prima Publishing, 1989
Buku Teks
Wenny Aidina, author
Fakultas Psikologi Universitas Indonesia, 2017
UI - Tesis Membership
Fakultas Psikologi Universitas Indonesia, 1982
UI - Skripsi Membership
Kail, Robert V., author
Prentice Hall International, 2001
Buku Teks SO