TY  - BOOK
AU  - Trecker, Harleigh B.
AU  -  Trecker, Audrey R
TI  - How to work with groups
U1  - 374.24 
PY  - 1958///
CY  - New York
PB  - Association Press
KW  - Social groups.
KW  - Social group work
KW  - Service social des groupes
ER  -