Jones, Mark, author
Elsevier, 2012
Buku Teks
Rawlings, Philip, author
Longman, 1999
Buku Teks
Roth, Mitchel P., author
Cengage Learning , 2010
Buku Teks
Rawlings, Philip, author
Longman, 1999
Buku Teks
Samaha, Joel, author
West Publishing, 1988
Buku Teks