Oloan Siagian, author
1990
UI - Skripsi (Membership)
Silaen, Sondang Maria J., author
1990
UI - Tesis (Membership)
Yatty Deviyati, author
Fakultas Psikologi Universitas Indonesia, 1990
UI - Skripsi (Membership)
Fakultas Psikologi Universitas Indonesia, 2005
UI - Skripsi (Membership)
Siti Agustinah, author
1989
UI - Skripsi (Membership)