Freeman, Frank S.
Holt, Rinehart and Winston, 1960
Buku Teks
Kiernan, John A.
Pergamon Press, 1981
Buku Teks
Lindholm, Charles
McGraw-Hill, 2001
Buku Teks
James C. Kaufman
Cambridge University Press, 2009
eBooks
Lodico, Marguerite G.
Jossey-Bass, 2010
Buku Teks