APA
United Nation D. o. E. a. S. A., United Nation D. o. E. a. S. A., . (1973). Sample Surveys of Current Interest. New York: United Nations.
Chicago
United Nation Department of Economic and Social Affairs, United Nation Department of Economic and Social Affairs, . 1973. Sample Surveys of Current Interest. New York: United Nations.
Harvard
United Nation D. o. E. a. S. A., United Nation D. o. E. a. S. A., . (1973). Sample Surveys of Current Interest. New York: United Nations.
MLA
United Nation Department of Economic and Social Affairs, United Nation Department of Economic and Social Affairs, . Sample Surveys of Current Interest. New York: United Nations. 1973.
