APA (7th ed.) Citation

Schreider, H., & Schreider, F. (1970). Exploring the Amazon. [National Geographic Society].

Chicago Style (17th ed.) Citation

Schreider, Helen, and Frank Schreider. Exploring the Amazon. Washington, D.C.: [National Geographic Society], 1970.

MLA (9th ed.) Citation

Schreider, Helen, and Frank Schreider. Exploring the Amazon. [National Geographic Society], 1970.