Citazione Stile APA (7a Edizione)

Purdom, P. . . . . . . . . W. (1971). Environmental health. Academic Press, a subsidiary of Harcourt Brace Jovanovich.

Citazione stile Chigago Style (17a edizione)

Purdom, P Walton. Environmental Health. New York: Academic Press, a subsidiary of Harcourt Brace Jovanovich, 1971.

Citatione MLA (9a ed.)

Purdom, P Walton. Environmental Health. Academic Press, a subsidiary of Harcourt Brace Jovanovich, 1971.