Cita APA (7th ed.)

Clark, D. W. (1981). Preventive and community medicine (2ª ed.). Little, Brown.

Cita Chicago (17th ed.)

Clark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.

Cita MLA (9th ed.)

Clark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.