Cita APA (7a ed.)

Kerley, B. (2015). With a friend by your side. National Geographic.

Cita Chicago Style (17a ed.)

Kerley, Barbara. With a Friend by Your Side. Washington, D.C.: National Geographic, 2015.

Cita MLA (8a ed.)

Kerley, Barbara. With a Friend by Your Side. National Geographic, 2015.

Precaución: Estas citas no son 100% exactas.