Merken, Melvin
Saunders College Publishing, 1993
Buku Teks
Wuest, Deborah
McGraw-Hill, 2012
Buku Teks
Moore, John A.
Harvard University Press , 1999
Buku Teks
Tillery, Bill W.
McGraw-Hill, Higher Education, 2007
Buku Teks
Harbeck, Richard M.
Holt Rinehart and Winston, 1965
Buku Teks