Seden, Janet, author
Open University Press, 2005
Buku Teks
Claringbull, Norman, author
Learning Matters, 2011
Buku Teks
Joyce, Phil, author
Sage Publications , 2004
Buku Teks
Field, Richard, author
Learning Matters,, 2012
Buku Teks
Nelson-Jones, Richard, author
Sage Publications, 2004
Buku Teks