Keefe, Robert H.
Springer Publishing Company, 2013
Buku Teks
Smith, Michael J.
Oxford University Press, 2010
Buku Teks
edited by Marc J. Schabracq, Jacques A.M. Winnubst, Cary L. Cooper
John Wiley & Sons, 2003
Buku Teks
Golightley, Malcom
Learning matters Ltd., 2008
Buku Teks
Karban, Kate
UK Polity Press, 2011
Buku Teks