Citazione Stile APA (7a Edizione)

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..

Citazione stile Chigago Style (17a edizione)

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.

Citatione 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.