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Macmillan, 1950
Buku Teks
Farbey, A.D., author
Gramedia Pustaka Utama, 1997
Buku Teks
FG Rafidh Al Farabi, author
Fakultas Psikologi Universitas Indonesia, 2004
UI - Tesis Membership
Fatimah Azzahra, author
2015
UI - Skripsi (Membership)
Rotzoll, Kim B.
GRID Publishing, 1976
Buku Teks