APA (7th ed.) Citation

Fielding, H. (1999). Bridget Jones's diary: A novel. Penguin Books.

Chicago Style (17th ed.) Citation

Fielding, Helen. Bridget Jones's Diary: A Novel. London [etc.]: Penguin Books, 1999.

MLA (9th ed.) Citation

Fielding, Helen. Bridget Jones's Diary: A Novel. Penguin Books, 1999.