Wu, Yuan-Li
Prentice-Hall, 1952
Buku Teks
Gorman, Clem
Currency, 1979
Buku Teks
edited by Paul Bohannan
University of Texas Press, 1967
Buku Teks
Hruska, Jan, 1957-, author
Ellis Horwood, 1993
Buku Teks
Tanham, George K., author
Frederick A. Praeger, 1962
Buku Teks