APA (7th ed.) Citation

Williams, S. H., & Stevens, R. K. (1988). Early Ordovician (Arenig) graptolites of the Cow Head Group, western Newfoundland, Canada. Canadian Soc. of Petrolium Geologists.

Chicago Style (17th ed.) Citation

Williams, S. H., and Robert K. Stevens. Early Ordovician (Arenig) Graptolites of the Cow Head Group, Western Newfoundland, Canada. Calgary, Alberta u.a: Canadian Soc. of Petrolium Geologists, 1988.

MLA (9th ed.) Citation

Williams, S. H., and Robert K. Stevens. Early Ordovician (Arenig) Graptolites of the Cow Head Group, Western Newfoundland, Canada. Canadian Soc. of Petrolium Geologists, 1988.