Fulong Wu
Routledge, 2006
Buku Teks
Chow, Gregory C., author
Harper & Row, 1985
Buku Teks
Simamora, Rudi Sansun, author
2007
UI - Skripsi (Membership)
Rathus, Spencer A., author
Allyn and Bacon, 1993
Buku Teks
Ananda Adityasanti, author
2001
UI - Skripsi (Membership)