APA (7th ed.) Citation

Powys, L., Marlow, L., & Gregory, A. (1943). The letters of Llewelyn Powys. John Lane.

Chicago Style (17th ed.) Citation

Powys, Llewelyn, Louis Marlow, and Alyse Gregory. The Letters of Llewelyn Powys. London: John Lane, 1943.

MLA (9th ed.) Citation

Powys, Llewelyn, et al. The Letters of Llewelyn Powys. John Lane, 1943.