Callahan, D. (1971). Ethics and population limitation. Population Council; distributed by Key Book Service, Bridgeport, Conn.
Chicago-Zitierstil (17. Ausg.)Callahan, Daniel. Ethics and Population Limitation. [New York: Population Council; distributed by Key Book Service, Bridgeport, Conn, 1971.
MLA-Zitierstil (9. Ausg.)Callahan, Daniel. Ethics and Population Limitation. Population Council; distributed by Key Book Service, Bridgeport, Conn, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.