Martin, Colin R., author
Routledge, 2000
Buku Teks
Sage Publications, 1992
Buku Teks
Shi, Leiyu, author
Delmar Cengage Learning, 2008
Buku Teks
Bowling, Ann, author
Open University Press, 2006
Buku Teks
Koch, Tina, author
Blackwell Publishing, 2006
Buku Teks