Sederberg, Peter C.
Chandler & Sharp Publishers, 1977
Buku Teks
Ethridge, Marcus E., author
Wadsworth, 2010
Buku Teks
Lipson, Leslie, author
Prentice-Hall, 1954
Buku Teks
Mackenzie, W.J.M
Penguin books, 1978
Buku Teks
Mackenzie, W.J.M
Penguin books, 1978
Buku Teks