Amin, Ash, author
Polity Press, 2010
Buku Teks
by Catherine Bauer ... [et al.] ; edited by Coleman Woddbury
University of Chicago Press, 1953
Buku Teks
Brown, A.J., author
Melbourne University Press, 1951
Buku Teks
Gillie, F.B., author
The Hague, 1971
Buku Teks
Greed, Clara H., author
Longman, 1994
Buku Teks