Mearns, Dave, author
Sage, 2003
Buku Teks
Casemore, Roger
Sage Publications, 2006
Buku Teks
Mearns, Dave, author
Sage Publications, 2003
Buku Teks
Gehart, Diane R, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Corey, Gerald, author
Refika Aditama , 2003
Buku Teks