Applegate, Lynda M., author
McGraw-Hill, 2003
Buku Teks
Lynch, Richard, author
Prentice-Hall, 2000
Buku Teks
Boyd, Harper W., Jr., author
Richard D. Irwin, 1958
Buku Teks
Ireland, R. Duane, author
South Western Cengage Learning, 2013
Buku Teks
Ansoff, H. Igor, author
Penguin Books, 1975
Buku Teks