TY  - BOOK
AU  - GALT (Anthony H) and Smith (Larry J).
TI  - Models and the study of social change
SN  - 0 470 15163 3
U1  - 303.4 GALM 
PY  - 1976///
CY  - New York.
PB  - Halsted press Book, John Wiley & Sons.
ER  -