APA (7th ed.) Citation

Heckel, P. H. (1973). Nature, origin, and significance of the Tully limestone: An anomalous unit in the Catskill Delta, Devonian of New York. Geological Society of America.

Chicago Style (17th ed.) Citation

Heckel, Philip H. Nature, Origin, and Significance of the Tully Limestone: An Anomalous Unit in the Catskill Delta, Devonian of New York. [Boulder, Colo.]: Geological Society of America, 1973.

MLA (9th ed.) Citation

Heckel, Philip H. Nature, Origin, and Significance of the Tully Limestone: An Anomalous Unit in the Catskill Delta, Devonian of New York. Geological Society of America, 1973.