TY  - BOOK
AU  - Lang,Kurt
AU  - Lang,Gladys Engel
TI  - Collective dynamics
AV  - HM251 .L25
U1  - 301.151 
PY  - 1961///]
CY  - New York
PB  - Crowell
KW  - Social interaction
KW  - Social groups
N1  - Includes bibliography
UR  - http://www.archive.org/details/collectivedynami00lang
UR  - http://www.openlibrary.org/books/OL5821655M
ER  -