Cronk, L. (2007). "Boy or girl: Gender preferences from a Darwinian point of view". Reproductive BioMedicine Online. 15: 23–32. doi:10.1016/S1472-6483(10)60546-9. PMID18088517.
Cronk, L. (2007). "Boy or girl: Gender preferences from a Darwinian point of view". Reproductive BioMedicine Online. 15: 23–32. doi:10.1016/S1472-6483(10)60546-9. PMID18088517.