Conde-Agudelo A, Rosas-Bermúdez A, Kafury-Goeta AC (April 2007). "Effects of birth spacing on maternal health: a systematic review". American Journal of Obstetrics and Gynecology. 196 (4): 297–308. doi:10.1016/j.ajog.2006.05.055. PMID17403398.
Ganatra B, Faundes A (October 2016). "Role of birth spacing, family planning services, safe abortion services and post-abortion care in reducing maternal mortality". Best Practice & Research. Clinical Obstetrics & Gynaecology. 36: 145–155. doi:10.1016/j.bpobgyn.2016.07.008. PMID27640082.
Kennedy KI, Rivera R, McNeilly AS (May 1989). "Consensus statement on the use of breastfeeding as a family planning method". Contraception. 39 (5): 477–96. doi:10.1016/0010-7824(89)90103-0. PMID2656086.
Bavel, Jan Van; Kok, Jan (2004-06-01). "Birth Spacing in the Netherlands. The Effects of Family Composition, Occupation and Religion on Birth Intervals, 1820–1885". European Journal of Population / Revue Européenne de Démographie. 20 (2): 119–140. doi:10.1023/B:EUJP.0000033860.39537.e2. ISSN0168-6577. S2CID153453194.
Rutstein SO (April 2005). "Effects of preceding birth intervals on neonatal, infant and under-five years mortality and nutritional status in developing countries: evidence from the demographic and health surveys". International Journal of Gynaecology and Obstetrics. 89 Suppl 1: S7–24. doi:10.1016/j.ijgo.2004.11.012. PMID15820369. S2CID37743580.
Conde-Agudelo A, Rosas-Bermúdez A, Kafury-Goeta AC (April 2007). "Effects of birth spacing on maternal health: a systematic review". American Journal of Obstetrics and Gynecology. 196 (4): 297–308. doi:10.1016/j.ajog.2006.05.055. PMID17403398.
Ganatra B, Faundes A (October 2016). "Role of birth spacing, family planning services, safe abortion services and post-abortion care in reducing maternal mortality". Best Practice & Research. Clinical Obstetrics & Gynaecology. 36: 145–155. doi:10.1016/j.bpobgyn.2016.07.008. PMID27640082.
Kennedy KI, Rivera R, McNeilly AS (May 1989). "Consensus statement on the use of breastfeeding as a family planning method". Contraception. 39 (5): 477–96. doi:10.1016/0010-7824(89)90103-0. PMID2656086.
Rutstein SO (April 2005). "Effects of preceding birth intervals on neonatal, infant and under-five years mortality and nutritional status in developing countries: evidence from the demographic and health surveys". International Journal of Gynaecology and Obstetrics. 89 Suppl 1: S7–24. doi:10.1016/j.ijgo.2004.11.012. PMID15820369. S2CID37743580.
Bavel, Jan Van; Kok, Jan (2004-06-01). "Birth Spacing in the Netherlands. The Effects of Family Composition, Occupation and Religion on Birth Intervals, 1820–1885". European Journal of Population / Revue Européenne de Démographie. 20 (2): 119–140. doi:10.1023/B:EUJP.0000033860.39537.e2. ISSN0168-6577. S2CID153453194.
Rutstein SO (April 2005). "Effects of preceding birth intervals on neonatal, infant and under-five years mortality and nutritional status in developing countries: evidence from the demographic and health surveys". International Journal of Gynaecology and Obstetrics. 89 Suppl 1: S7–24. doi:10.1016/j.ijgo.2004.11.012. PMID15820369. S2CID37743580.
Bavel, Jan Van; Kok, Jan (2004-06-01). "Birth Spacing in the Netherlands. The Effects of Family Composition, Occupation and Religion on Birth Intervals, 1820–1885". European Journal of Population / Revue Européenne de Démographie. 20 (2): 119–140. doi:10.1023/B:EUJP.0000033860.39537.e2. ISSN0168-6577. S2CID153453194.