Cite
Systematic assessment of the sex ratio at birth for all countries and estimation of national imbalances and regional reference levels.
MLA
Fengqing Chao, et al. “Systematic Assessment of the Sex Ratio at Birth for All Countries and Estimation of National Imbalances and Regional Reference Levels.” Proceedings of the National Academy of Sciences of the United States of America, vol. 116, no. 27, July 2019, pp. 9303–11. EBSCOhost, https://doi.org/10.1073/pnas.1812593116.
APA
Fengqing Chao, Gerland, P., Cook, A. R., & Alkema, L. (2019). Systematic assessment of the sex ratio at birth for all countries and estimation of national imbalances and regional reference levels. Proceedings of the National Academy of Sciences of the United States of America, 116(27), 9303–9311. https://doi.org/10.1073/pnas.1812593116
Chicago
Fengqing Chao, Patrick Gerland, Alex R. Cook, and Leontine Alkema. 2019. “Systematic Assessment of the Sex Ratio at Birth for All Countries and Estimation of National Imbalances and Regional Reference Levels.” Proceedings of the National Academy of Sciences of the United States of America 116 (27): 9303–11. doi:10.1073/pnas.1812593116.