Cita APA (7th ed.)
Protzman, F. (2009). Live, laugh, celebrate. National Geographic.
Cita Chicago (17th ed.)
Protzman, Ferdinand. Live, Laugh, Celebrate. Washington, D.C.: National Geographic, 2009.
Cita MLA (9th ed.)
Protzman, Ferdinand. Live, Laugh, Celebrate. National Geographic, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.