Burns, Diane
Brady, 1988
Buku Teks
Hirst, David L., author
Macmillan, 1985
Buku Teks
Li, Qing, author
Metafor Publishing, 2001
Buku Teks
Beck, Roger, author
Blackwell Publishing, 2007
Buku Teks
Hoffmann, Laurence D., author
McGraw-Hill, 1993
Buku Teks