McClave, James T., author
Prentice-Hall, 2001
Buku Teks
Anderson, David Ray, 1941-, author
Thomson South-Western, 2008
Multimedia
Heitzman, William R., author
Allyn and Bacon, 1980
Buku Teks
Smith, Frank C., author
Richard D. Irwin, 1960
Buku Teks
Shao, Stephen P., author
Charles E. Merrill, 1976
Buku Teks