APA
United Nations E. a. S. A. (. o., United Nations E. a. S. A. (. o., . (1972). World economic survey, 1971. NA: NA.
Chicago
United Nations Economic and Social Affairs (Department of-), United Nations Economic and Social Affairs (Department of-), . 1972. World economic survey, 1971. NA: NA.
Harvard
United Nations E. a. S. A. (. o., United Nations E. a. S. A. (. o., . (1972). World economic survey, 1971. NA: NA.
MLA
United Nations Economic and Social Affairs (Department of-), United Nations Economic and Social Affairs (Department of-), . World economic survey, 1971. NA: NA. 1972.