APA (7th ed.) Citation

Lang, M., Mills, A. W., & Lang, A. (2006). The Red Book of Heroes. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lang, Mrs, Arthur Wallis Mills, and Andrew Lang. The Red Book of Heroes. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Lang, Mrs, et al. The Red Book of Heroes. Project Gutenberg, 2006.

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