APA
"UN I. E. a. S. A., "UN I. E. a. S. A., . (1979). World Population situation in 1977 New beginging and uncertain ends. New: York United Nations Publication.
Chicago
"UN International Economic and Social Affairs", "UN International Economic and Social Affairs", . 1979. World Population situation in 1977 New beginging and uncertain ends. New: York United Nations Publication.
Harvard
"UN I. E. a. S. A., "UN I. E. a. S. A., . (1979). World Population situation in 1977 New beginging and uncertain ends. New: York United Nations Publication.
MLA
"UN International Economic and Social Affairs", "UN International Economic and Social Affairs", . World Population situation in 1977 New beginging and uncertain ends. New: York United Nations Publication. 1979.
