edited by Margo Todd
Routledge, 1995
Buku Teks
Wilcox, Helen
John Wiley & Sons Inc,, 2014
Buku Teks
Schwyzer, Philip
Cambridge University Press, 2009
eBooks
Mikalachki, Jodi
Routledge, 1998
Buku Teks
Matchinske, Megan
Cambridge University Press, 1998
eBooks