APA (7th ed.) Citation

Schulz, J. H. (1991). The world ageing situation, 1991. United Nations.

Chicago Style (17th ed.) Citation

Schulz, James H. The World Ageing Situation, 1991. New York: United Nations, 1991.

MLA (9th ed.) Citation

Schulz, James H. The World Ageing Situation, 1991. United Nations, 1991.