Gary M White (August 1998). "Recent findings in the epidemiologic evidence, classification, and subtypes of acne vulgaris". J. Am. Acad. Dermatol. 39 (2 Pt 3): S34–7. doi:10.1016/S0190-9622(98)70442-6. PMID9703121.
Gary M White (August 1998). "Recent findings in the epidemiologic evidence, classification, and subtypes of acne vulgaris". J. Am. Acad. Dermatol. 39 (2 Pt 3): S34–7. doi:10.1016/S0190-9622(98)70442-6. PMID9703121.