Amin, Ash, author
Polity Press, 2010
Buku Teks
Stevenson, Deborah, author
Open University Press, 2003
Buku Teks
Forman, Richard T. T., author
Cambridge University Press, 2014
Buku Teks
by Catherine Bauer ... [et al.] ; edited by Coleman Woddbury
University of Chicago Press, 1953
Buku Teks
Jarvis, Helen, author
Prentice-Hall, 2001
Buku Teks