Petersen, W. (1972). Readings in population. Macmillan.
Chicago Style (17th ed.) ZitazioaPetersen, William. Readings in Population. New York: Macmillan, 1972.
MLA (9th ed.) ZitazioaPetersen, William. Readings in Population. Macmillan, 1972.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.