@article{Maccoby1979,
author = {Maccoby, E.E. and Doering, C.H. and Jacklin, N.C. and Kraemer, H.},
title= {Concentration of sex hormones in umbilical cord blood: Their relation to sex and birth order of infants},
year = {1979},
doi = {10.2307/1128928},
journal = {Child Development},
volume = {50},
number = {3},
pages = {632--642},
}