Pritchard, Colin, author
Routledge, 2006
Buku Teks
Field, Richard, author
Learning Matters,, 2012
Buku Teks
Kongstvendt, Peter R., author
Jones & Bartlet Learning, 2009
Buku Teks
McCoyd, Judith L.M, author
Roudledge, 2016
Buku Teks
Coppock, Vicki, author
SAGE, 2010
Buku Teks