APA (7th ed.) Citation

Hodge, E. T. (1924). A proposed classification of igneous rocks. The University.

Chicago Style (17th ed.) Citation

Hodge, Edwin Thomas. A Proposed Classification of Igneous Rocks. Eugene: The University, 1924.

MLA (9th ed.) Citation

Hodge, Edwin Thomas. A Proposed Classification of Igneous Rocks. The University, 1924.