Gray, Ivan, author
Learning matters Ltd., 2010
Buku Teks
Wolper, Lawrence F., author
Jones and Bartlett, 2011
Buku Teks
Porter-O`Grady, Tim, author
Mosby Elsevier, 2011
Buku Teks
Barr, Jill, author
Sage , 2012
Buku Teks
edited by Diane L. Huber
Saunders/Elsevier, 2014
Buku Teks