Koch, Tina, author
Blackwell Publishing, 2006
Buku Teks
Steven S. Coughlin, Selina A. Smith, and Maria E. Fernandez, editors
Oxford University Press, 2017
eBooks
A Milbank Resource Bock, 1973
Buku Teks
Bowling, Ann, author
Open University Press, 2006
Buku Teks
Shi, Leiyu, author
Delmar Cengage Learning, 2008
Buku Teks