TY  - JOUR
A1  - David, P.A.
A1  - Sanderson, W.C. 
T1  - The emergence of a two-child norm among American birth-controllers
Y1  - 1987
DO  - 10.2307/1972119
JF  - Population and Development Review 
VL  - 13
IS  - 1
SP  - 1
EP  - -41

ER  -