Bannantine, Julie A.
Prentice-Hall, 1990
Buku Teks
Comer, M. J.
Tata McGraw-Hill, 1979
Buku Teks
Comer, Ronald J
New York W.H. Freeman and Co. 1998,
Buku Teks
Burke, James J.
Marcel Dekker, 1994
Buku Teks
Comer, David J.
Addison-Wesley, 1981
Buku Teks