The helping relationship sourcebook /
Edited by Donald L. Avila, Arthur W. Combs [and] William W. Purkey.

APA Citation

Avila, D. L., Purkey, W. Watson., Combs, A. W. (Arthur Wright). (1971). The helping relationship sourcebook. Boston: Allyn and Bacon.

MLA Citation

Avila, Donald L, William Watson Purkey, and Arthur W. (Arthur Wright) Combs. The Helping Relationship Sourcebook. Boston: Allyn and Bacon, 1971.

Warning: These citations may not always be complete (especially for serials).