Besserer, C. W.
Prentice-Hall, 1959
Buku Teks
Bertol, Daniela, author
John Wiley & Sons, 1997
Buku Teks
Addesso, Patricia J., author
American Management Association, 2007
eBooks
editors, Time-Life Books
Time-Life Books, 1977
Buku Teks
Krier, Rob, author
Academy Editions, 1991
Buku Teks