APA (7th ed.) Citation

Riccardi, A. C. (1988). The Cretaceous system of southern South America.

Chicago Style (17th ed.) Citation

Riccardi, Alberto C. The Cretaceous System of Southern South America. Boulder, Colo, 1988.

MLA (9th ed.) Citation

Riccardi, Alberto C. The Cretaceous System of Southern South America. 1988.

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