Wall-Wieler, E. et al. 2017. Teenage pregnancy: The impact of maternal adolescent childbearing and older sister’s teenage: IJPDS (2017) Issue 1, Vol 1:006, Proceedings of the IPDLN Conference (August 2016). International Journal of Population Data Science. 1, 1 (Apr. 2017). DOI:https://doi.org/10.23889/ijpds.v1i1.20.