Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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