Cita APA (7th ed.)

Barnard, J. D. (1967). Science: A key to the future. Macmillan.

Cita Chicago (17th ed.)

Barnard, J. Darrell. Science: A Key to the Future. New York: Macmillan, 1967.

Cita MLA (9th ed.)

Barnard, J. Darrell. Science: A Key to the Future. Macmillan, 1967.