Cita APA (7th ed.)
Clark, D. W. (1967). Preventive medicine. Little Brown.
Cita Chicago (17th ed.)
Clark, Duncan W. Preventive Medicine. Boston: Little Brown, 1967.
Cita MLA (9th ed.)
Clark, Duncan W. Preventive Medicine. Little Brown, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.