APA (7th ed.) Citation

Wilde, O. (1959). The picture of Dorian Gray. Penguin Books.

Chicago Style (17th ed.) Citation

Wilde, Oscar. The Picture of Dorian Gray. Harmondsworth [etc.]: Penguin Books, 1959.

MLA (9th ed.) Citation

Wilde, Oscar. The Picture of Dorian Gray. Penguin Books, 1959.

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