Kirk J. Schneider, J. Fraser Pierson, James F.T. Bugental, editor
Sage Publications, 2001
Buku Teks
editor, Kirk J. Schneider, James F.T. Bugental, J. Fraser Pierson
Sage Publications, 2001
Buku Referensi
DeCarvalho, Roy Jose
Praeger , 1991
Buku Teks
[edited by] Elaine Lynne La Monica
Wadsworth Health Sciences Division, 1985
Buku Teks SO
edited by Edmund A. Bowles
Prentice-Hall, 1967
Buku Teks SO