DeCoster, Don T., author
John Wiley & Sons, 1982
Buku Teks
DeCoster, Don T., author
John Wiley & Sons, 1988
Buku Teks
Emerald, 2017
eBooks
Maher, Michael W., 1946-, author
Richard D. Irwin , 1997
Buku Teks
Norgaard, Corine T., author
Prentice-Hall, 1985
Buku Teks