APA (7th ed.) Citation

Tracy, L., McFall, J. V., & Parsons, A. W. (2010). The Silent Barrier. Project Gutenberg.

Chicago Style (17th ed.) Citation

Tracy, Louis, J. V. McFall, and A. W. Parsons. The Silent Barrier. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Tracy, Louis, et al. The Silent Barrier. Project Gutenberg, 2010.

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