University of California Press, 1971
Buku Teks
Nolan, Dennis R.
West Publishing Company, 1979
Buku Teks
Indah Kurnia, author
2017
UI - Tesis (Membership)
Harahap, M. Yahya, author
Sinar Grafika, 2004
Buku Teks
Harahap, M. Yahya, author
Sinar Grafika, 2006
Buku Teks