TY  - BOOK
AU  - Heap,Ken
TI  - Group theory for social workers: an introduction 
T2  - Social work series
SN  - 0080189563.
AV  - HM131 .H3713 1976
PY  - 1977///
CY  - Oxford, New York
PB  - Pergamon Press
KW  - Social groups
KW  - Small groups
KW  - Social group work
N1  - Includes bibliography and index
ER  -