APA (7th ed.) Citation

Knyvett, T., Schofield, B., & Knyvett, K. B. (1949). The Knyvett letters, 1620-1644. Constable.

Chicago Style (17th ed.) Citation

Knyvett, Thomas, Bertram Schofield, and Katherine Burgh Knyvett. The Knyvett Letters, 1620-1644. London: Constable, 1949.

MLA (9th ed.) Citation

Knyvett, Thomas, et al. The Knyvett Letters, 1620-1644. Constable, 1949.