APA

Schell L. M., Relethford J. H., Madan M., Naamon P. B. N. & Hook E. B. (1994). Unequal adaptive value of changing cigarette use during pregnancy for heavy, moderate, and light smokers. : American journal of human biology : the official journal of the Human Biology Council.

Chicago

Schell Lawrence M, Relethford John H, Madan Mamta, Naamon Paul B N and Hook Ernest B. 1994. Unequal adaptive value of changing cigarette use during pregnancy for heavy, moderate, and light smokers. : American journal of human biology : the official journal of the Human Biology Council.

Harvard

Schell L. M., Relethford J. H., Madan M., Naamon P. B. N. and Hook E. B. (1994). Unequal adaptive value of changing cigarette use during pregnancy for heavy, moderate, and light smokers. : American journal of human biology : the official journal of the Human Biology Council.

MLA

Schell Lawrence M, Relethford John H, Madan Mamta, Naamon Paul B N and Hook Ernest B. Unequal adaptive value of changing cigarette use during pregnancy for heavy, moderate, and light smokers. : American journal of human biology : the official journal of the Human Biology Council. 1994.