Kiusalaas, Jaan
Cambridge University Press , 2010
Buku Teks
Chapman, Stephen J.
Cengage Learning, 2013
Buku Teks
Etter, Delores Maria, 1947-
Prentice-Hall, 2002
Buku Teks SO
Academic Press, 2015
eBooks
Palm III, Wiliam J.
Mc Graw Hill, 2011
Buku Teks