Nicola Yelland
Open University Press, 2010
Buku Teks
Evans, Ellis D.
Holt, Rinehart and Wiston, 1971
Buku Teks
Curtis, Audrey, author
Routledge, 2009
Buku Teks
Karen Menke Paciorek, editor
McGraw-Hill, 2014
Buku Teks
Karen Menke Paciorek, editor
McGraw-Hill, 2012
Buku Teks