Nathe, Christine Nielsen., author
Pearson Education , 2011
Buku Teks
Burt, Brian A., author
An academic Internet Publishers, 2007
Buku Teks
by Blanaid Daly [and others]
Oxford University Press, 2013
Buku Teks
DeBiase, Christina B., author
Lea & Febiger, 1991
Buku Teks
Patel, Meera, author
Radcliffe Publishing, 2007
Buku Teks