Laurie, Ian C.
Chichester: John Wiley & Sons, 1979
Buku Teks
by Catherine Bauer ... [et al.] ; edited by Coleman Woddbury
University of Chicago Press, 1953
Buku Teks
by Catherine Bauer [and others]; edited by Coleman Woodbury
The University of Chicago Press, 1953
Buku Teks
Amin, Ash
Polity Press, 2010
Buku Teks
Stevenson, Deborah
Open University Press, 2003
Buku Teks