Carnegie, Dale, 1888-1955, author
Dale Carnegie & Associates, 1984
Buku Teks
edited by Alfred Rappaport
Prentice-Hall, 1982
Buku Teks
Juwita Permatasari Nuh, author
Universitas Indonesia, 2016
UI - Tesis (Membership)
Schroede, Roger G
McGraw-Hill Book, 1985
Buku Teks
Dyckman, Thomas R., author
Macmillan, 1969
Buku Teks