TY  - BOOK
AU  - Heap,Ken
TI  - Group theory for social workers: an introduction 
SN  - 0080189563
PY  - 1977///
CY  - Oxford
PB  - Pergamon Press
KW  - Social groups
KW  - Small groups
KW  - Social group work
N1  - original title : Gruppeteori for sosialairbeidere; Bibliography: p. 236-246
ER  -