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Natividad, Josefina N., Nimfa B. Ogena, Grace T. Cruz, Elma P. Laguna, Maria Paz N. Marquez, Arnisson Andre C. Ortega, Christian Joy P. Cruz, and Maria Midea M. Kabamalan. The 2013 Young Adult Fertility and Sexuality Study in the Philippines. Quezon City: Demographic Research and Development Foundation, University of the Philippines Population Institute, 2016.

Natividad, Josefina N., et al. The 2013 Young Adult Fertility and Sexuality Study in the Philippines. Demographic Research and Development Foundation, University of the Philippines Population Institute, 2016.