TY  - BOOK
AU  - Petersen William
AU  -  Petersen. Renee
TI  - Dictionary of demography :  Terms, concepts, and in   
U1  - Y:5k, M6.1-M6.2/RR 
PY  - 1986///
CY  - New York
PB  - Greenwood Press        
N1  - Bibliography chapterwise
ER  -