Podmore, Valerie N. , author
McGraw-Hill, 2012
Buku Teks
Nicola Yelland
Open University Press, 2010
Buku Teks
Trawick-Smith, Jeffrey W., author
Pearson, 2014
Buku Teks
edited by Nicola Yelland
Open University Press, 2005
Buku Teks
Paciorek, Karen Menke, author
McGraw-Hill, Higher Education, 2008
Buku Teks