Sprenger, Polly, author
Virgin, 2001
Buku Teks
McDonald, Mlcolm, author
John Wiley & Sons, 2011
Buku Teks
Dewey, Barbara I., author
Oryx Press, 1987
Buku Teks
Culligan, Matthew, author
Gramercy, 1979
Buku Teks
Elkin, A. P., author
Angus and Robertson, 1966
Buku Teks