APA (7th ed.) Citation

Breckenridge, G. (2012). The Radio Boys on Secret Service Duty. Project Gutenberg.

Chicago Style (17th ed.) Citation

Breckenridge, Gerald. The Radio Boys on Secret Service Duty. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Breckenridge, Gerald. The Radio Boys on Secret Service Duty. Project Gutenberg, 2012.

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