Peale, Norman Vincent, 1898-1993
Prentice-Hall, 1954
Buku Teks
Biswas-Diener, Robert
Wiley, 2010
Buku Teks
Daniels, Aubrey C.
Mc-Graw-Hill, 2000
Buku Teks
Abifa Arif
Fakultas Psikologi Universitas Indonesia, 2012
UI - Skripsi (Open)
Strohmer, Arthur F
Addison-Wesley , 1970
Buku Teks