Molyneaux, Dorothy
Allyn and Bacon,, 1982.
Buku Teks
Longman, 1996
Buku Teks
Yopi Ruki Kusuma, author
2017
UI - Skripsi (Membership)
Nisrina Andini Larasati, author
Fakultas Psikologi Universitas Indonesia, 2016
UI - Skripsi (Membership)
Marcic, Dorothy
Jossey-Bass, 1997
Buku Teks