edited by E.K. Fisk and H. Osman-Rani
Oxford University Press, 1982
Buku Teks
Gough, Ian, author
Macmillan, 1992
Buku Teks
Balaam, David N., 1950-, author
Prentice-Hall, 1996
Buku Teks
edited by W. Ladd Hollist
Westview Press, 1985
Buku Teks
Schwesinger, Borries, author
Thames & Hudson, 2010
Buku Teks