Cita APA (7a ed.)

Halacy, D. S. (1971). Now or never: The fight against pollution. Four Winds Press.

Cita Chicago Style (17a ed.)

Halacy, D. S. Now or Never: The Fight Against Pollution. New York: Four Winds Press, 1971.

Cita MLA (9a ed.)

Halacy, D. S. Now or Never: The Fight Against Pollution. Four Winds Press, 1971.