APA (7th ed.) Citation

Powys, J. C., Roberts, P., Trovillion, H. W., & Trovillion, V. (1990). The letters of John Cowper Powys to Hal W. and Violet Trovillion. C. Woolf.

Chicago Style (17th ed.) Citation

Powys, John Cowper, Paul Roberts, Hal W. Trovillion, and Violet Trovillion. The Letters of John Cowper Powys to Hal W. and Violet Trovillion. London: C. Woolf, 1990.

MLA (9th ed.) Citation

Powys, John Cowper, et al. The Letters of John Cowper Powys to Hal W. and Violet Trovillion. C. Woolf, 1990.