Kalipa, Z., D.T. Goon, E.M. Yako, and A. Okeyo. 2017. “Factors Influencing Adherence to Folic Acid and Ferrous Sulphate Nutritional Intake Among Pregnant Teenagers in Buffalo City Municipality, South Africa”. Pakistan Journal of Nutrition 16 (7): 531–537. https://doi.org/10.3923/pjn.2017.531.537.