APA (7th ed.) Citation

Rockwell, C., Ley, W., & Glanzman, L. (2006). Sabotage in Space. Project Gutenberg.

Chicago Style (17th ed.) Citation

Rockwell, Carey, Willy Ley, and Louis Glanzman. Sabotage in Space. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Rockwell, Carey, et al. Sabotage in Space. Project Gutenberg, 2006.

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