APA (7th ed.) Citation

Bonner, R., & Wrenn, C. L. (2004). The Boy Inventors' Radio Telephone. Project Gutenberg.

Chicago Style (17th ed.) Citation

Bonner, Richard, and Charles L. Wrenn. The Boy Inventors' Radio Telephone. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Bonner, Richard, and Charles L. Wrenn. The Boy Inventors' Radio Telephone. Project Gutenberg, 2004.

Warning: These citations may not always be 100% accurate.