Weber, Ron
McGraw-Hill International Book Company, 1982
Buku Teks
Akmal
Erlangga, 2010
Buku Teks
Hall. James A
Thomson/South-Western, 2005
Buku Teks
Cascarino, Richard
John Wiley & Sons, 2007
Buku Teks
Kaufman, Felix
The Ronald Press Co. , 1961
Buku Teks