Hannah, Larry S., author
Addison-Wesley, 1977
Buku Teks
edited by G. Douglas Mayo
Memphis State University Press, 1979
Buku Teks
Fakultas Psikologi Universitas Indonesia, 1990
UI - Skripsi Membership
editor, Patrick Griffin, Barry McGaw, Esther Care
Springer, 2012
eBooks
Wolf, Richard M., author
Praeger, 1979
Buku Teks