Morton, Frederic
Atheneum, 1962
Buku Teks
Manchester, William
Little, Brown, 1959
Buku Teks
Rina
Fakultas Psikologi Universitas Indonesia, 2007
UI - Tesis (Membership)
Galvin, Kathleen M.
Scott, Foresman and Company , 1982
Buku Teks
Ballinger Publishing Company, 1986
Buku Teks