APA (7th ed.) Citation

Tower, W. E., Turton, C. M., Cope, T. D., & Smith, C. H. (2012). Physics. Project Gutenberg.

Chicago Style (17th ed.) Citation

Tower, Willis Eugene, Charles Mark Turton, Thomas Darlington Cope, and Charles Henry Smith. Physics. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Tower, Willis Eugene, et al. Physics. Project Gutenberg, 2012.

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