Universitas Indonesia, 1992
UI - Skripsi (Membership)
Universitas Indonesia, 1993
UI - Skripsi (Membership)
Nussbaum, Allen, author
Prentice-Hall, 1976
Buku Teks
Jenkins, Francis A., author
McGraw-Hill Book, [date of publication not identified]
Buku Teks
Hecht, Eugene, author
Addison-Wesley Publishing, 2002
Buku Teks