APA (7th ed.) Citation

Newman, J. H., Stanford, D., & Spark, M. (1957). Letters of John Henry Newman: A selection. Owen.

Chicago Style (17th ed.) Citation

Newman, John Henry, Derek Stanford, and Muriel Spark. Letters of John Henry Newman: A Selection. London: Owen, 1957.

MLA (9th ed.) Citation

Newman, John Henry, et al. Letters of John Henry Newman: A Selection. Owen, 1957.