Tageson, C. William
Dorsey Press, 1982
Buku Teks
Cohen, John
George Allen and Unwin, 1958
Buku Teks
DeCarvalho, Roy Jose
Praeger , 1991
Buku Teks
[edited by] Elaine Lynne La Monica
Wadsworth Health Sciences Division, 1985
Buku Teks
editor, Kirk J. Schneider, James F.T. Bugental, J. Fraser Pierson
Sage Publications, 2001
Buku Referensi