Citação norma APA

DiFranza, J., & Coleman, M. (2001). Sources of tobacco for youths in communities with strong enforcement of youth access laws. BMJ Group.

Citação norma Chicago

DiFranza, J., and M. Coleman. Sources of Tobacco for Youths in Communities With Strong Enforcement of Youth Access Laws. BMJ Group, 2001.

Citação norma MLA

DiFranza, J., and M. Coleman. Sources of Tobacco for Youths in Communities With Strong Enforcement of Youth Access Laws. BMJ Group, 2001.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.