Braverman, Avishay, author
World Bank, 1989
Buku Teks
Edited by Wilbert E. Moore and Neil J. Smelser.
Prentice-Hall, 1966
Buku Teks
edited by Richard M. Bird and Oliver Oldman
Johns Hopkins Press, 1964
Buku Teks
edited by Richard M. Bird
John Hopkins University Press, 1975
Buku Teks
Kitchen, Richard L., author
John Wiley & Sons, 1986
Buku Teks