Cita APA

Gregg, I., & Nunn, A. J. (1989). Peak expiratory flow in symptomless elderly smokers and ex-smokers.

Citación estilo Chicago

Gregg, I., y A. J. Nunn. Peak Expiratory Flow in Symptomless Elderly Smokers and Ex-smokers. 1989.

Cita MLA

Gregg, I., y A. J. Nunn. Peak Expiratory Flow in Symptomless Elderly Smokers and Ex-smokers. 1989.