21. Professional psychology, research and practice. [Washington, D.C.] : American Psychological Association CP616 MPT503 MPT505 CP617
22. Relationship: the heart of helping people Perlman, Helen Harris Chicago : The University of Chicago Press, 1983. SW201
23. The city and the grassroots: a cross-cultural theory of urban social movements Castells, Manuel, 1942- Berkeley, Calif. : University of California Press, c1983. HIST350
