APA (7th ed.) Citation

Alves, E., Azevedo, A., Correia, S., & Barros, H. (2013). Long-Term Maintenance of Smoking Cessation in Pregnancy: An Analysis of the Birth Cohort Generation XXI.

Chicago Style (17th ed.) Citation

Alves, E., A. Azevedo, S. Correia, and H. Barros. Long-Term Maintenance of Smoking Cessation in Pregnancy: An Analysis of the Birth Cohort Generation XXI. 2013.

MLA (8th ed.) Citation

Alves, E., et al. Long-Term Maintenance of Smoking Cessation in Pregnancy: An Analysis of the Birth Cohort Generation XXI. 2013.