TY  - BOOK
AU  - Kreveld,David van
TI  - Structure and outcomes of study groups: a method of determining several properties of group structure and some relationships observed with group outcomes 
PY  - 1970///
CY  - Van Gorcum
PB  - Assen
KW  - Sociometry
N1  - Summary in Dutch; Bibliography: p. 60-64
ER  -