edited by Kenneth Fidel
Transaction Books, 1975
Buku Teks
Nafziger, E. Wayne, author
Prentice-Hall, 1990
Buku Teks
Duke University Press, 1987
Buku Teks
Beeby, C. E., author
Harvard University Press, 1966
Buku Teks
National academy of sciences, 1973
Buku Teks