Gorini, Catherine A., author
Course Technology Cengage Learning, 2012
Buku Teks
Ellis, Dave, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Stevenson, R. L. (Robert Louis), author
David Campbell, 1992
Buku Teks
Bulgakov, Mikhail, author
Everyman's Library, 1992
Buku Teks
Billings, Keith H., author
New York: Van Nostrand Reinhold, 1993,
Buku Referensi