Hay, Julie, author
Open University Press, 2007
Buku Teks
edited by Christine Knott
Learning Matters, 2010
Buku Teks
Copley, Selina, author
Learning Matters, 2011
Buku Teks
edited by Jan Fook
Allen & Unwin, 1996
Buku Teks
Seedhouse, David, author
Sage Publications, 2019
eBooks