APA (7th ed.) Citation

Hoefer, H. J., Perrottet, T., & Gil, E. (1991). Peru. APA Publications.

Chicago Style (17th ed.) Citation

Hoefer, Hans Johannes, Tony Perrottet, and Eduardo Gil. Peru. Hongkong: APA Publications, 1991.

MLA (9th ed.) Citation

Hoefer, Hans Johannes, et al. Peru. APA Publications, 1991.