Chaudhari, H. K., P. K. Shah, K. R. Pai, and N. B. D’Souza. “Combined Protein C and Protein S Deficiency With Pregnancy”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 7, Feb. 2017, pp. 2450-2, doi:10.18203/2320-1770.ijrcog20162148.