Kohn, Howard
Simon & Schuster , 1998
Buku Teks
FitzGerald, Frances, 1940-, author
Simon & Schuster, 2017
Buku Teks
Porter, Charles O. (Charles Orlando), 1919-2006, author
Macmillan, 1961
Buku Teks
Antje Barabasch
Springer, 2012
eBooks
Shuman, Howard E.
Prentice-Hall, 1992
Buku Teks