Rasmussen, A. Eric, author
Co-operative College of Canada, 1975
Buku Teks
Owens, Richard N., author
Richard D. Irwin, 1969
Buku Teks
Faguet, Dmitri, author
John Wiley & Sons, 2003
Multimedia
Stephen A.Ross
Mc Graw Hill, 2009
Buku Teks
by Arthur J. Keown, John D. Martin, J. William Petty, David F. Scott
Prentice-Hall, 2001
Buku Teks