Cita APA (7a ed.)

National Geographic Learning, Dummett, P., Hughes, J., & Stephenson, H. (2014). Life: Advanced [C1]. Heinle, Cengage Learning.

Cita Chicago Style (17a ed.)

National Geographic Learning, Paul Dummett, John Hughes, y Helen Stephenson. Life: Advanced [C1]. Andover, Hampshire: Heinle, Cengage Learning, 2014.

Cita MLA (9a ed.)

National Geographic Learning, et al. Life: Advanced [C1]. Heinle, Cengage Learning, 2014.