Mahnke, Frank H.
John Wiley & Sons Inc., 1987
Buku Teks
Mahnke, Frank H.
Van Nostrand Reinhod, 1996
Buku Teks
Cambridge University Press, 2016
eBooks
Whelan, Bride M., author
Rockport Publisher, 2005
Buku Teks
Sutton, Tina, author
Page One Publishing, 2008
Buku Referensi