Shipps, Steve, author
Blackwell Publishing, 2008
Buku Teks
Brannan, James A., author
McGraw-Hill, 2011
Buku Teks
Ferre, John P., author
Charles E. Merrill Pub. Co., 1983
Buku Referensi
Ferre, John P
Columbus : Charles E. Merril Publishing company,1983,
Buku Referensi
Kumar, Ranjit, author
Sage , 2014
Buku Teks