Cita APA (7a ed.)

Yapp, N., Brinkley, D., & Johns, C. (2007). 100 days in photographs: Pivotal events that changed the world. National Geographic and Getty images.

Cita Chicago Style (17a ed.)

Yapp, Nicholas, Douglas(Foreword) Brinkley, y Chris(Intro.) Johns. 100 Days in Photographs: Pivotal Events That Changed the World. Washington: National Geographic and Getty images, 2007.

Cita MLA (9a ed.)

Yapp, Nicholas, et al. 100 Days in Photographs: Pivotal Events That Changed the World. National Geographic and Getty images, 2007.