APA (7th ed.) Citation

Unesco, International Geological Correlation Programme, & International Union of Geological Sciences. Geological correlation. UNESCO.

Chicago Style (17th ed.) Citation

Unesco, International Geological Correlation Programme, and International Union of Geological Sciences. Geological Correlation. Paris: UNESCO.

MLA (8th ed.) Citation

Unesco, et al. Geological Correlation. UNESCO.

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