Rawlings, Philip, author
Longman, 1999
Buku Teks
Sage Publications, 1998
Buku Teks
Norri, Alan
Weidenfeld and Nicolson, 1992
Buku Teks
Yingyi, Situ, author
Sage Publications, 2000
Buku Teks
McDougall, Carrie, 1978-, author
Cambridge University Press, 2015
Buku Teks