Gaya APA

D., E., M. (2008). Environmental Factors and Asthma : What We Learned from Epidemiological Studies - Immunology and Allergy Clinics of North America, Vol. 28 . Philadelphia: Elsevier.

Gaya MLA

D., E., M.. Environmental Factors and Asthma : What We Learned from Epidemiological Studies - Immunology and Allergy Clinics of North America, Vol. 28. Philadelphia: Elsevier, 2008. Text.