APA (7th ed.) Citation

Maitland, F. W., Montague, F. C., & Colby, J. F. (1915). A sketch of English legal history. Putnam.

Chicago Style (17th ed.) Citation

Maitland, Frederic William, F. C. Montague, and James Fairbanks Colby. A Sketch of English Legal History. New York: Putnam, 1915.

MLA (9th ed.) Citation

Maitland, Frederic William, et al. A Sketch of English Legal History. Putnam, 1915.