Frederick A. Praeger Publishers, [date of publication not identified]
Buku Teks
Jasny, Naum
The University of Chicago Press , 1961
Buku Teks
Nove, Alec
George Allen and Unwin, 1973
Buku Teks
University of Queensland Press, 1976
Buku Teks
Prentice-Hall, 1994
Buku Teks