Maheshwari, B.L.
Tata McGraw-Hill, 1990
Buku Teks
Griffin, Ricky W.
Houghton Miffiln, 1990
Buku Teks
edited by C. Edward Weber and Gerald Peters
International Textbook Company, 1969
Buku Teks SO
Algie, Jimmy
Kogan Page, 1975
Buku Referensi
Deegan, Arthur X.
Aspen Systems Corp., 1982
Buku Teks