Dyfyniad APA

Cotes, J. E. (1989). Prevalence and diagnosis of chronic respiratory symptoms.

Dyfyniad Arddull Chicago

Cotes, J. E. Prevalence and Diagnosis of Chronic Respiratory Symptoms. 1989.

Dyfyniad MLA

Cotes, J. E. Prevalence and Diagnosis of Chronic Respiratory Symptoms. 1989.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.