Birdsall, Stephen S., author
John Wiley & Sons, 1992
Buku Teks SO
Mittleman, Earl N.
New York University, [date of publication not identified]
Buku Teks
Birdsall, Stephen S., author
John Wiley & Sons, 1992
Buku Teks SO
United States Information Agency, 1991
Buku Teks
edited by Nathan Glick
United Sates Information Agency, 1989
Buku Teks