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