Ware, F.C.
A Pantheon Books, [date of publication not identified]
Buku Teks
Robillard, Walter G., author
John Wiley & Sons, 2014
Buku Teks
Surrey University Press, 1984
Buku Teks
Brown, Paul L.
Ronald Press Co , 1953
Buku Teks
Brown, Lester R.
W.W. Norton & Company, Inc., 1974
Buku Teks