Cita APA (7a ed.)

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 Corp..

Cita Chicago Style (17a ed.)

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 Corp., 1969.

Cita MLA (9a ed.)

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 Corp., 1969.