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Davis DL, Gottlieb MB, Stampnitzky JR (April 1998). "Reduced ratio of male to female births in several industrial countries: a sentinel health indicator?". JAMA. 279 (13): 1018–23. doi:10.1001/jama.279.13.1018. PMID9533502.
Kvarnemo, C.; Ahnesjo, I. (1996). "The dynamics of operational sex ratios and competition for mates". Trends in Ecology & Evolution. 11 (10): 404–408. doi:10.1016/0169-5347(96)10056-2. PMID21237898.
Mendl M, Zanella AJ, Broom DM, Whittemore CT (1995). "Maternal social status and birth sex ratio in domestic pigs: an analysis of mechanisms". Animal Behaviour. 50 (5): 1361–70. doi:10.1016/0003-3472(95)80051-4. S2CID53173184.
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China's sex ratio declines for two straight years Xinhua, China (16 August 2011) – "Li Bin, director of the National Population and Family Planning Commission, made the remarks at a press conference (...). China's sex ratio at birth was 118.08 males for every 100 females in 2010, according to census data, Li said."
Laplace, P. (1778). "Mémoire sur les probabilités"(PDF). Mémoires de l'Académie royale des sciences de Paris. 9: 227–332. Archived from the original(PDF) on 27 April 2015. Retrieved 13 May 2018.