Alexander APR
1995
UI - Skripsi (Membership)
Sari Endahwarni
1990
UI - Tesis (Membership)
Simanjuntak, Renard
Fakultas Psikologi Universitas Indonesia, 1998
UI - Skripsi Membership
Hutabarat, Samuel Erik
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2007
UI - Tesis Membership
edited by Edwin Seaver
World Pub., 1948
Buku Teks