edited by A. James Casner
Little, Brown, 1952
Buku Teks
Sandercock, Leonie Kay
A Silverfish Book, 1979
Buku Teks
Bowman, Arthur G.
Prentice-Hall, 1970
Buku Teks
Cohen, Leon W., author
D. Van Nostrand, 1963
Buku Teks
Khublall, N., author
Butterworths, 1996
Buku Teks