APA (7th ed.) Citation

Carreira Helena, Pereira Marta, Azevedo Ana, & Lunet Nuno. (2012). Trends in the prevalence of smoking in Portugal: A systematic review. BMC.

Chicago Style (17th ed.) Citation

Carreira Helena, Pereira Marta, Azevedo Ana, and Lunet Nuno. Trends in the Prevalence of Smoking in Portugal: A Systematic Review. BMC, 2012.

MLA (9th ed.) Citation

Carreira Helena, et al. Trends in the Prevalence of Smoking in Portugal: A Systematic Review. BMC, 2012.

Warning: These citations may not always be 100% accurate.