APA (7th ed.) Citation

Lyell, C. (1969). Principles of geology: Being an attempt to explain the former changes of the earth's surface by reference to causes now in operation. Johnson Reprint Corporation.

Chicago Style (17th ed.) Citation

Lyell, Charles. Principles of Geology: Being an Attempt to Explain the Former Changes of the Earth's Surface by Reference to Causes Now in Operation. New York: Johnson Reprint Corporation, 1969.

MLA (9th ed.) Citation

Lyell, Charles. Principles of Geology: Being an Attempt to Explain the Former Changes of the Earth's Surface by Reference to Causes Now in Operation. Johnson Reprint Corporation, 1969.