Barbour, Stephen
Cambridge [England]; New York Cambridge University Press 1990,
Buku Teks
Churchill, Gilbert A., author
The Dryden Press, 1995
Buku Teks
Churchill, Gilbert A., author
Thomson, 2005
Buku Teks
edited by J.M. Gvishiani
Pergamon Press, 1984
Buku Teks
Watts, Simon, author
Sage, 2013
Buku Teks