(1971). Long-Term planning. United Nations.
Chicago Style (17. basım) AtıfLong-Term Planning. New York: United Nations, 1971.
MLA (9th ed.) AtıfLong-Term Planning. United Nations, 1971.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..
(1971). Long-Term planning. United Nations.
Chicago Style (17. basım) AtıfLong-Term Planning. New York: United Nations, 1971.
MLA (9th ed.) AtıfLong-Term Planning. United Nations, 1971.