APA ציטוט

Hook, E. B., & Cross, P. K. (1988). Maternal cigarette smoking, Down syndrome in live births, and infant race.

Citação norma Chicago

Hook, E B., and P K. Cross. Maternal Cigarette Smoking, Down Syndrome in Live Births, and Infant Race. 1988.

ציטוט MLA

Hook, E B., and P K. Cross. Maternal Cigarette Smoking, Down Syndrome in Live Births, and Infant Race. 1988.