Rude, Robert T., 1942-, author
Prentice-Hall, 1986
Buku Teks
Clark, Margaret M., 1926-
Scholastic , 1994
Buku Teks
Fina Febriani, author
Fakultas Psikologi Universitas Indonesia, 2016
UI - Tesis (Membership)
by Martha Dallmann ... [et al.]
Holt, Rinehart and Winston, 1982
Buku Teks
Burns, Paul C., author
Houghton Miffiln, 1984
Buku Teks