Graves, Robert
Penguin Books , 1944
Buku Teks
Brown, John Mason, author
Harper & Row, 1965
Buku Teks
Brown, John Mason, author
Harper & Row, 1965
Buku Teks
Nasution, Chocky Charly Raja, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2013
UI - Skripsi (Membership)
Indah Siti Rachmadani, author
Fakultas Psikologi Universitas Indonesia, 2008
UI - Skripsi (Open)