(en) Marc Michael, Lawrence King, Liang Guo, Martin McKee, Erica Richardson et David Stuckler, « The Mystery of Missing Female Children in the Caucasus: An Analysis of Sex Ratios by Birth Order », International Perspectives on Sexual and Reproductive Health, vol. 39, no 2, , p. 97–102 (PMID23895886, DOI10.1363/3909713)
(en) Marc Michael, Lawrence King, Liang Guo, Martin McKee, Erica Richardson et David Stuckler, « The Mystery of Missing Female Children in the Caucasus: An Analysis of Sex Ratios by Birth Order », International Perspectives on Sexual and Reproductive Health, vol. 39, no 2, , p. 97–102 (PMID23895886, DOI10.1363/3909713)