King, Gillian M.
Blackwell Scientific Pub., 1982
Buku Referensi
editors, Norman K. Wessells, Elizabeth M. Center
William Kaufmann, 1973
Buku Teks
Rugh, Roberts
Burgess, 1961
Buku Teks
Pandey, B.N.
Tata McGraw-Hill, 2012
Buku Teks
Hildebrand, Milton, 1918-
John Wiley & Sons, 1982
Buku Teks