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John Wiley & Sons, 1981
Buku Teks
Gray, C.B., author
Longman Scientific & Technical, 1989
Buku Teks
Emmanuel Wullur, author
Fakultas Psikologi Universitas Indonesia, 2023
UI - Dokumentasi
Wildi, Theodore, author
Prentice-Hall, 1997
Buku Teks
Maulida Bellafaransi, author
2015
UI - Skripsi (Membership)