APA (7th ed.) Citation

Howitt, M., Howitt, M., & Howitt, W. (1889). Mary Howitt: An autobiography. W. Isbister.

Chicago Style (17th ed.) Citation

Howitt, Mary, Margaret Howitt, and William Howitt. Mary Howitt: An Autobiography. London: W. Isbister, 1889.

MLA (9th ed.) Citation

Howitt, Mary, et al. Mary Howitt: An Autobiography. W. Isbister, 1889.