Hayes, Philip
McGraw-Hill, 2011
Buku Teks SO
Pietrzak, Theodore
ASTD Press, 2005
eBooks
Yerbury, Hilary
University of Technology, 1992
Buku Referensi
Pantry, Sheila
Facet Publishing, 2003
Buku Teks SO
DuBrin, Andrew J.
Reston Publishing Company, 1983
Buku Teks SO