APA (7th ed.) Citation

Johnson, J. H. (1969). A review of the lower Cretaceous algae.

Chicago Style (17th ed.) Citation

Johnson, J. H. A Review of the Lower Cretaceous Algae. Golden, Colo, 1969.

MLA (9th ed.) Citation

Johnson, J. H. A Review of the Lower Cretaceous Algae. 1969.