American Psychological Association
Avila, Donald, & Combs, Arthur W, & Purkey, William W (Eds.). ( 1977 ). Helping Relationship Sourcebook ( 00 ed. ). Alpha House.
Modern Language Association
Avila, Donald and Combs, Arthur W and Purkey, William W. Helping Relationship Sourcebook . Alpha House. 1977
Chicago Citation
Avila, Donald and Combs, Arthur W and Purkey, William W. Helping Relationship Sourcebook . 00 .Barcelona
: Alpha House, 1977.
American Medical Association
Avila, Donald and Combs, Arthur W and Purkey, William W. Helping Relationship Sourcebook . Alpha House; 1977.