Varberg, Dale E., author
Erlangga, 2010
Buku Teks
Kerckhove, Michael G.
McGraw-Hill, 1993
Buku Teks
Hildebrand, Francis Begnaud, author
Prentice Hall of India, 1977
Buku Teks
Kaplan, Wilfred, author
Addison-Wesley, 1963
Buku Teks
Hardy, Darel W.
Wadsworth , 1975
Buku Teks