APA (7th ed.) Citation

Gregory, J. W. (1931). General Stratigraphy. Methuen.

Chicago Style (17th ed.) Citation

Gregory, John W. General Stratigraphy. London: Methuen, 1931.

MLA (9th ed.) Citation

Gregory, John W. General Stratigraphy. Methuen, 1931.

Warning: These citations may not always be 100% accurate.