1. Arifeen, S. E. (1997). Birth weight intrauterine growth retardation and prematurity: prospective study of infant growth and survival in the slums of Dhaka, Bangladesh. Doctor of Public Health dissertation, Johns Hopkins University, Baltimore.
2. Maternal smoking and its association with birth weight;Bernstein;Obstet Gynecol,2005
3. The complex relationship between smoking and very preterm delivery: Results of the Epipage study;Burguet;BJOG,2004
4. Department Statistic Malaysia Crude Birth Rate (2007). www.indexmundi.com
5. Djauzi, S. (2005). Panduan Hidup Sihat, dari Soal Pemeriksaan Kesihatan Sampai Vertigo, Jakarta. Kompas.