The four ages of Down syndrome.

MLA

Bittles, Alan H., et al. “The Four Ages of Down Syndrome.” European Journal of Public Health, vol. 17, no. 2, Apr. 2007, pp. 221–25. EBSCOhost, https://doi.org/10.1093/eurpub/ckl103.

APA

Bittles, A. H., Bower, C., Hussain, R., & Glasson, E. J. (2007). The four ages of Down syndrome. European Journal of Public Health, 17(2), 221–225. https://doi.org/10.1093/eurpub/ckl103

Chicago

Bittles, Alan H, Carol Bower, Rafat Hussain, and Emma J Glasson. 2007. “The Four Ages of Down Syndrome.” European Journal of Public Health 17 (2): 221–25. doi:10.1093/eurpub/ckl103.