APA (7th ed.) Citation

Hilton, W., & Underhill, E. (1948). The scale of perfection. J. M. Watkins.

Chicago Style (17th ed.) Citation

Hilton, Walter, and Evelyn Underhill. The Scale of Perfection. London: J. M. Watkins, 1948.

MLA (9th ed.) Citation

Hilton, Walter, and Evelyn Underhill. The Scale of Perfection. J. M. Watkins, 1948.