MLA
Li, Yu, et al. Cigarette Smoking, Cytochrome P4501a1 Polymorphisms, and Breast Cancer Among African-american and White Women. BioMed Central Ltd, 2004. https://doi.org/10.17615/szqr-hg20
APA
Li, Y., Millikan, R., Bell, D., Cui, L., Tse, C., Newman, B., & Conway, K. (2004). Cigarette smoking, cytochrome P4501A1 polymorphisms, and breast cancer among African-American and white women. BioMed Central Ltd. https://doi.org/10.17615/szqr-hg20
Chicago
Li, Yu, Robert C Millikan, Douglas A Bell, Lisa Cui, Chiu Kit Tse, Beth Newman, and Kathleen Conway. 2004. Cigarette Smoking, Cytochrome P4501a1 Polymorphisms, and Breast Cancer Among African-American and White Women. BioMed Central Ltd. https://doi.org/10.17615/szqr-hg20