Seden, Janet, author
Open University Press, 2005
Buku Teks
Trevithick, Pamela, author
McGraw-Hill , 2012
Buku Teks
Cournoyer, Barry R., author
Brooks/Cole Cengage Learning, 2011
Buku Teks
Koprowska, Juliet, author
Learning Matters, 2007
Buku Teks
Koprowska, Juliet, author
Learning, Matters, 2005
Buku Teks