Burns, Robert C.
New York, 1982
Buku Teks
Callaghan, Barry
General Publishing Co. Limited, 1978
Buku Teks
Thomas, Marvin L.
New York: McGraw-Hill, 1978
Buku Teks
Liebing, Ralph W.
John Wiley & Sons, 1999
Buku Teks
Snyder, James
John Wiley & Sons, 1998
Buku Teks