Martinez, F. J., Raczek, A. E., Seifer, F. D., Conoscenti, C. S., Curtice, T. G., D'Eletto, T., . . . Phillips, A. L. (2008). Development and Initial Validation of a Self-Scored COPD Population Screener Questionnaire (COPD-PS). Informa Healthcare.

Martinez, Fernando J., Anastasia E. Raczek, Frederic D. Seifer, Craig S. Conoscenti, Tammy G. Curtice, Thomas D'Eletto, Claudia Cote, Clare Hawkins, và Amy L. Phillips. Development and Initial Validation of a Self-Scored COPD Population Screener Questionnaire (COPD-PS). Informa Healthcare, 2008.

Martinez, Fernando J., et al. Development and Initial Validation of a Self-Scored COPD Population Screener Questionnaire (COPD-PS). Informa Healthcare, 2008.