APA (7th ed.) Citation

Putnam, G. H., & Herbert, R. G. (2008). The Little Gingerbread Man. Project Gutenberg.

Chicago Style (17th ed.) Citation

Putnam, George Haven, and Robert Gaston Herbert. The Little Gingerbread Man. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Putnam, George Haven, and Robert Gaston Herbert. The Little Gingerbread Man. Project Gutenberg, 2008.

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