Portman, Jackie, author
Wiley-Blackwell, 2014
Buku Teks
White, J. Noel, author
George Allen and Unwin, 1973
Buku Teks
Edward Mills, editor
Reed Educational and Professional, 1994
Buku Referensi
Dilworth, James B., 1939-, author
McGraw-Hill, 1992
Buku Teks
Mills, Edward D.
Butter Worths, 1980
Buku Teks