APA (7th ed.) Citation

Powys, J. C., Knight, G. W., & Blackmore, R. L. (1983). The letters of John Cowper Powys to G.R. Wilson Knight. C. Woolf.

Chicago Style (17th ed.) Citation

Powys, John Cowper, G. Wilson Knight, and R. L. Blackmore. The Letters of John Cowper Powys to G.R. Wilson Knight. London: C. Woolf, 1983.

MLA (9th ed.) Citation

Powys, John Cowper, et al. The Letters of John Cowper Powys to G.R. Wilson Knight. C. Woolf, 1983.