APA (7th ed.) Citation

Ash, S. R., Read, C. B., & Zeller, R. A. (1976). North American species of Tempskya and their stratigraphic significance. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Ash, Sidney R., C. B. Read, and Robert A. Zeller. North American Species of Tempskya and Their Stratigraphic Significance. Washington: United States Department of the Interior, Geological Survey, 1976.

MLA (9th ed.) Citation

Ash, Sidney R., et al. North American Species of Tempskya and Their Stratigraphic Significance. United States Department of the Interior, Geological Survey, 1976.