Savransky, Semyon D.
CRC Press, 2000
Buku Teks
Fogler, H. Scott
Prentice-Hall, 2008
Buku Teks
Starko, Alane Jordan
Lawrence Erlbaum Associates, 2005
Buku Teks
Thatchenkery, Tojo
Berrett-Koehler, 2006
Buku Teks
Titis Endarwidiarti
Fakultas Psikologi Universitas Indonesia, 2004
UI - Skripsi (Membership)