Curtis, Michael, author
Harper & Row, 1978
Buku Teks
Klesner, Joseph L., author
McGrawHill education, 2014
Buku Teks
edited by Nimrod Raphaeli
Allyn and Bacon, 1967
Buku Teks
Chilcote, Ronald H., author
Routledge, 2000
eBooks
Stephen J. Wayne [et all.]
Thomson, 2005
Buku Teks