Mingus, Nancy, author
Prenada, 2004
Buku Teks
Miller, Michael, author
Prenada Media, 2005
Buku Teks
Sinaga, Ferdinand, author
1995
UI - Skripsi (Membership)
A. Suryana Sudrajat, author
Gramedia Pustaka Utama, 2000
Buku Teks
Jos Utama, author
UI-Press, 1992
UI - Pidato