Greene, Thomas H., author
Prentice-Hall, 1984
Buku Teks
Hagopain, Mark N.
Longman, 1978
Buku Teks
Christian Soe
McGraw-Hill, 2004
Buku Teks
Barringron, Lowell, author
Wadsworth and Cengage Learning, 2013
Buku Teks
McCormick, John, 1954-, author
Thomson Wadsworth, 2004
Buku Teks