DeCarvalho, Roy Jose
Praeger , 1991
Buku Teks
editor, Kirk J. Schneider, James F.T. Bugental, J. Fraser Pierson
Sage Publications, 2001
Buku Referensi
Kirk J. Schneider, J. Fraser Pierson, James F.T. Bugental, editor
Sage Publications, 2001
Buku Teks
Cohen, John
George Allen and Unwin, 1958
Buku Teks
Tageson, C. William
Dorsey Press, 1982
Buku Teks