Djioe Let Beng
Program Pascasarjana Universitas Indonesia, 2004
UI - Tesis (Membership)
Sembiring, Barnabas
Program Pascasarjana Universitas Indonesia, 1999
UI - Tesis (Membership)
Sihombing, Antony
Lambert Academic Pub., 2010
Buku Teks
Karp, David A.
Praeger, 2015
Buku Teks
Manurung, Oscar Frits
Fakultas Psikologi Universitas Indonesia, 1997
UI - Skripsi (Membership)