Gaya APA
MARSHALL, E, [., KURTZ, P, D, [.
(1982).
Interpersonal helping skills
.
San Francisco:
Jossey-Bass.
Gaya MLA
MARSHALL, Eldon, [ed.]., KURTZ, P., David, [ed.].
"Interpersonal helping skills".
San Francisco:
Jossey-Bass,
1982.
Buku.