1. Trussell J (1988) Teenage pregnancy in the United States. Fam Plann Perspect 20:262–272
2. Ventura SJ, Abma JC, Mosher WD, Henshaw SK (2009) Estimated pregnancy rates for the United States, 1990–2005: an update. Natl Vital Stat Rep 58:1–14
3. Massachusetts Births 2007. Division of Research and Epidemiology, Bureau of Health information, Statistics, Research and Evaluation, Boston, MA. Massachusetts Department of Public Health 2009, online at: http://www.mass.gov/dph/bhsre/resep/resep.htm#birth . Retrieved April 1, 2010
4. Statistisches Bundesamt der Bundesrepublik Deutschland. Auswertung Lebendgeborene nach dem Alter der Mutter 2000–2008. Statistisches Bundesamt Wiesbaden, Germany 2009
5. Friede A, Baldwin W, Rhodes PH (1987) Young maternal age and infant mortality: the role of low birth weight. Public Health Rep 102:192–199