Barker, Chris
Research methods in clinical psychology : an introduction for students and practitioners
John Wiley & Sons, 2002
 Buku Teks SO
Schroeder, David A.
The psychology of helping and altruism: problems and puzzles
McGraw-Hill, 1995
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Theresia Maharini
Coping lanjut usia pria terhadap kematian pasangan
Fakultas Psikologi Universitas Indonesia, 1997
 UI - Skripsi Membership
Hebb, Donald Olding
a Textbook of psychology: modern Asia edition
W.B. Saunders Company, 1961
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Guilford, Joy Paul, 1897-1987
Psychometric methods
McGraw-Hill, 1954
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