Brown, Wilfred
Heinemann, 1971
Buku Teks
Mund, Vernon A., author
Appleton-Century-Crofts, 1971
Buku Teks
McNulty, James E., author
University of Pennsylvania Press, 1964
Buku Teks
Brown, Warren B., author
John Wiley & Sons, 1980
Buku Teks
Lundgren, Earl F., author
Confield, 1974
Buku Teks