APA (7e ed.) Bronvermelding

Brown, L. R. (1978). The twenty-ninth day: Accommodating human needs and numbers to the earth's resources. Norton.

Chicago (17e ed.) Bronvermelding

Brown, Lester Russell. The Twenty-ninth Day: Accommodating Human Needs and Numbers to the Earth's Resources. New York: Norton, 1978.

MLA (9e ed.) Bronvermelding

Brown, Lester Russell. The Twenty-ninth Day: Accommodating Human Needs and Numbers to the Earth's Resources. Norton, 1978.