Penguin Books, 1978
Buku Teks
Todaro, Michael P., author
Longman, 1992
Buku Teks
Haq, Mahbub ul, 1934-1998, author
Columbia University Press, 1976
Buku Teks
Handelman, Howard, author
Pearson/Prentice Hall, 2006
Buku Teks
Angelopoulos, Angelos
Preager, 1972
Buku Teks