Marx, Groucho
Simon and Schuster, 1967
Buku Teks
Fabregas, Antonio, author
Edinburgh University Press, 2012
Buku Teks
Joos, Irene, author
Reston publishing , 1985
Buku Teks
Skousen, Mark, author
Routledge, 2015
eBooks
Schilling, John W., author
American Management Association, 2008
eBooks