Colley, Susan Jane
Prentice-Hall, , 1998
Buku Teks
Coleman, Rodney
Springer, 2012
eBooks
Williamson, Richard E.
Prentice-Hall, 1972
Buku Teks
Phillips, H.B. (Henry Bayard)
J. Wiley & Sons, inc.; London, Chapman & Hall, limited, 1933
Buku Teks SO
Marsden, Jerrold E.
W H Freeman and Co, 1976
Buku Teks SO