Vimarsh, 1995
Buku Teks
Simmons, George B.
The population council, 1971
Buku Teks
Chandrasekhar, S., author
University of North Carolina Press, 1972
Buku Teks
Rina, author
Fakultas Psikologi Universitas Indonesia, 2007
UI - Tesis (Membership)
Galvin, Kathleen M.
Scott, Foresman and Company , 1982
Buku Teks