Cita APA (7th ed.)

Eckholm, E. P. (1977). The picture of health: Environmental sources of disease. Norton.

Cita Chicago (17th ed.)

Eckholm, Erik P. The Picture of Health: Environmental Sources of Disease. New York: Norton, 1977.

Cita MLA (9th ed.)

Eckholm, Erik P. The Picture of Health: Environmental Sources of Disease. Norton, 1977.