APA (7th ed.) Citation

Stockton, F. R. (1990). The lady, or the tiger? Project Gutenberg.

Chicago Style (17th ed.) Citation

Stockton, Frank Richard. The Lady, or the Tiger? Champaign, Ill: Project Gutenberg, 1990.

MLA (9th ed.) Citation

Stockton, Frank Richard. The Lady, or the Tiger? Project Gutenberg, 1990.