Connelly, James F., author
Macmillan, 1978
Buku Teks
Kramer, Arthur D., author
McGraw-Hill, 1984
Buku Teks
Ewen, Dale, author
Prentice-Hall, 1983
Buku Teks
Stark, Thomas J., author
Benjamin Cumming, 1984
Buku Teks SO
Washington, Allyn J., author
Pearson - Prentice Hall, 2009
Buku Teks SO