Cita APA (7a ed.)

Walker, R. (2011). What is the theory of evolution? Crabtree Pub..

Cita Chicago Style (17a ed.)

Walker, Robert. What Is the Theory of Evolution? New York, N.Y.: Crabtree Pub., 2011.

Cita MLA (8a ed.)

Walker, Robert. What Is the Theory of Evolution? Crabtree Pub., 2011.

Precaución: Estas citas no son 100% exactas.