APA (7th ed.) Citation

Wilde, O. (1997). The Importance of Being Earnest: A Trivial Comedy for Serious People. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wilde, Oscar. The Importance of Being Earnest: A Trivial Comedy for Serious People. Project Gutenberg, 1997.

MLA (9th ed.) Citation

Wilde, Oscar. The Importance of Being Earnest: A Trivial Comedy for Serious People. Project Gutenberg, 1997.

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