Veatch, Robert M.
Oxford University Press, 2015
Buku Teks
Springer Science+Business Media, 2015
eBooks
Knapp, Michael C.
Ohio South-Western, 1998
Buku Teks
Ingram, Robert W.
Thomson/South-Western, 2004
Multimedia
Ingram, Robert W.
South-Western Publishing, 2004
Buku Teks