Gelfer, Marylou Pausewang
McGraw-Hill, 1996
Buku Teks
Gilliam, Ronald B.
Jones and Bartlett Publishers, 2011
Multimedia
Holland, Audrey L.
Plural Publishing, 2007
Buku Teks
Fogle, Paul T.
Delmer, 2013
Buku Teks
edited by Shelagh Brumfitt
Wiley - Blackwell, 2010
Buku Teks