APA (7th ed.) Citation

Powys, J. C., Gregg, F., Wilkinson, O. M., & Wilkinson, C. (1994). The letters of John Cowper Powys to Frances Gregg. Cecil Woolf.

Chicago Style (17th ed.) Citation

Powys, John Cowper, Frances Gregg, Oliver Marlow Wilkinson, and Christopher Wilkinson. The Letters of John Cowper Powys to Frances Gregg. London: Cecil Woolf, 1994.

MLA (9th ed.) Citation

Powys, John Cowper, et al. The Letters of John Cowper Powys to Frances Gregg. Cecil Woolf, 1994.