APA (7th ed.) Citation

Grossmith, G., & Grossmith, W. (1965). The diary of a nobody. Penguin Books.

Chicago Style (17th ed.) Citation

Grossmith, George, and Weedon Grossmith. The Diary of a Nobody. Harmondsworth, Eng. ; Baltimore: Penguin Books, 1965.

MLA (8th ed.) Citation

Grossmith, George, and Weedon Grossmith. The Diary of a Nobody. Penguin Books, 1965.

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