APA (7th ed.) Citation

Ames, B., Plaza, M. S. d. l., & Acha, J. G. (2000). Armored knights. National Geographic.

Chicago Style (17th ed.) Citation

Ames, Betsy, Milagros Sánchez de la Plaza, and Joaquín Gutiérrez Acha. Armored Knights. District of Columbia: National Geographic, 2000.

MLA (9th ed.) Citation

Ames, Betsy, et al. Armored Knights. National Geographic, 2000.