Cambridge University Press, 2017
eBooks
Kinnell, Margaret, author
Library Association Publishing, 2001
Buku Teks
Loertscher, David V., author
Hi Willow Research & Publishing, 2009
Buku Referensi
edited by Michael Dewe
Ashgate , 2002
Buku Teks
Edited by Bill Katz
The Haworth Press , 1985
Buku Teks