Brown, L. R. (1978). The twenty-ninth day: Accommodating human needs and numbers to the earth's resources. Norton.
Chicago-referens (17:e uppl.)Brown, Lester Russell. The Twenty-ninth Day: Accommodating Human Needs and Numbers to the Earth's Resources. New York: Norton, 1978.
MLA-referens (9:e uppl.)Brown, Lester Russell. The Twenty-ninth Day: Accommodating Human Needs and Numbers to the Earth's Resources. Norton, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.