Cite
Down's syndrome: sex difference in relation to maternal age.
MLA
Perry, T. B., et al. “Down’s Syndrome: Sex Difference in Relation to Maternal Age.” Lancet (London, England), vol. 2, no. 7718, July 1971, pp. 263–64. EBSCOhost, https://doi.org/10.1016/s0140-6736(71)92601-8.
APA
Perry, T. B., Qazi, Q. H., Lanman, J. T., Ros, Y., Hayez-Delatte, F., & Van de Poel, H. (1971). Down’s syndrome: sex difference in relation to maternal age. Lancet (London, England), 2(7718), 263–264. https://doi.org/10.1016/s0140-6736(71)92601-8
Chicago
Perry, T B, Q H Qazi, J T Lanman, Y Ros, F Hayez-Delatte, and H Van de Poel. 1971. “Down’s Syndrome: Sex Difference in Relation to Maternal Age.” Lancet (London, England) 2 (7718): 263–64. doi:10.1016/s0140-6736(71)92601-8.