{{Cite journal| doi = 10.1016/j.earlhumdev.2019.104868| issn = 03783782| volume = 141| pages = 104868| last1 = Tafuro| first1 = Sara| last2 = Guilmoto| first2 = Christophe Z.| title = Skewed sex ratios at birth: A review of global trends| journal = Early Human Development| access-date = 2020-06-23| date = 2020-02| url = https://linkinghub.elsevier.com/retrieve/pii/S0378378219305225}}