APA (7th ed.) Citation

Williamson, A. M., Williamson, C. N., & De Maris, W. (2010). The Brightener. Project Gutenberg.

Chicago Style (17th ed.) Citation

Williamson, A. M., C. N. Williamson, and Walter De Maris. The Brightener. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Williamson, A. M., et al. The Brightener. Project Gutenberg, 2010.

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