The helping relationship sourcebook /
Avila, Donald L.,
The helping relationship sourcebook / edited by Donald Avila, Arthur W. Combs, William W. Purkey. - Second - Boston : Allyn and Bacon, c1977. - xv, 253 p. ; 24 cm.
The helping relationship sourcebook / edited by Donald Avila, Arthur W. Combs, William W. Purkey. - Second - Boston : Allyn and Bacon, c1977. - xv, 253 p. ; 24 cm.