APA (7th ed.) Citation

United nations. (1992). Geological correlation: Number 20, Paris, september 1992. UN.

Chicago Style (17th ed.) Citation

United nations. Geological Correlation: Number 20, Paris, September 1992. Paris: UN, 1992.

MLA (8th ed.) Citation

United nations. Geological Correlation: Number 20, Paris, September 1992. UN, 1992.

Warning: These citations may not always be 100% accurate.