A. Hemachandra, T. Rungruxsirivorn, S. Taneepanichskul, and K. Pruksananonda, “KAP Study on Contraception in Teenage Pregnancy at Antenatal Care Clinic and Delivery Room in Chulalongkorn Memorial Hospital”, Thai J Obstet Gynaecol, vol. 18, no. 4, pp. 154–164, May 2012.