Jegatheswaran และ Sandrasekeram. (1990) Proximate determinants of fertility in Sri Lanka : an analysis of Bongaarts'model. Mahidol University,:ม.ป.ท.Jegatheswaran และ Sandrasekeram. 1990. Proximate determinants of fertility in Sri Lanka : an analysis of Bongaarts'model. ม.ป.ท.:Mahidol University,;Jegatheswaran และ Sandrasekeram. Proximate determinants of fertility in Sri Lanka : an analysis of Bongaarts'model. ม.ป.ท.:Mahidol University, 1990. Print.