Garrett, Gill, author
Macmillan, 1983
Buku Teks
Regula H. Robnett , Walter C. Chop, edited
Jones and Bartlett Learning, 2015
Buku Teks
Alan Walker, Liam Foster, editors
Elgar Research Colection, 2014
Buku Teks
Cambridge University Press, 2005
Buku Teks
Novak, Mark, author
Pearson, 2014
Buku Teks