Devine, Tom, author
Berrett-Koehler, 2011
Buku Teks
Sage , 2012
Buku Teks
Joseph Di Giacomo, editor-in-chief
McGraw-Hill, 1990
Buku Referensi
edited by Graeme Brooker and Lois Weinthal
Bloomsbury Academic, 2013
Buku Teks
Strong, Roy, author
Conran Octopus, 1987
Buku Referensi