APA (7th ed.) Citation

(1989). The Precambrian-Cambrian boundary. Clarendon Pr.

Chicago Style (17th ed.) Citation

The Precambrian-Cambrian Boundary. Oxford: Clarendon Pr, 1989.

MLA (9th ed.) Citation

The Precambrian-Cambrian Boundary. Clarendon Pr, 1989.

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