Baldwin, Robert C., author
Ronald Press, 1950
Buku Teks
New, Christopher, author
Routledge, 1999
Buku Teks
Horner, Chris, author
Cambridge, 2004
Buku Teks
Lamarque, Peter, author
Blackwell Publishing, 2009
Buku Teks
edited by A. Phillips Griffiths
Cambridge University Press, 1984
Buku Teks