Chang, Gordon G., author
Century, 2001
Buku Teks
Peffer, Nathaniel, author
George Routledge & Sons, 1931
Buku Teks
Rickards, James, author
Portfolio Penguin, 2015
Buku Teks
Gerst, Eric D., author
American Management Association, 2008
eBooks
Alvares, Julia
A Plume Book, 1996
Buku Teks