Thames & Hudson
Mario Praken, 2007
Buku Teks
Burton, Philip Ward, 1910-, author
Grid Publishing, 1978
Buku Teks
Office of Instructiomnal Development University of Maryland University College, 1992
Buku Teks
Bovee, Courtland L., author
Richard D. Irwin, 1989
Buku Teks
Batra, Rajeev, author
Prentice-Hall, 1996
Buku Teks