Monterrosa-Castro, Álvaro, and Merizalde Arias-Martínez. “Vaginal and Caesarean Births in Adolescents: Patterns from 1993-2005 in the Rafael Calvo Maternity Hospital in Cartagena, Colombia”. Revista Colombiana De Obstetricia Y Ginecología, vol. 58, no. 2, June 2007, pp. 108-15, doi:10.18597/rcog.470.