Lawrence M. Salinger, editor
Sage Reference, 2013
Buku Referensi
Julie R O'Sullivan
West, 2012
Buku Teks
Minkes, John
Sage , 2008
Buku Teks
Heckscher, Charles
BasicBooks , 1995
Buku Teks
edited by Cary L. Cooper and Judi Marshall
John Wiley & Sons, 1980
Buku Teks