APA (7th ed.) Citation

Whiteley, O. S. (1920). The diary of Opal Whiteley. Putnam.

Chicago Style (17th ed.) Citation

Whiteley, Opal Stanley. The Diary of Opal Whiteley. London: Putnam, 1920.

MLA (8th ed.) Citation

Whiteley, Opal Stanley. The Diary of Opal Whiteley. Putnam, 1920.

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