Day, David V., author
Routledge, 2009
Buku Teks
Allen, Scott J., author
American Management Association, 2011
Buku Teks
Dewar, Donald L.
Quality Circle Institute , 1984
Buku Teks
Ikeda, Daisaku, 1928-, author
[publisher not identified], [date of publication not identified]
Buku Teks
Qualman, Erik, author
McGraw-Hill, 2012
Buku Teks