APA (7th ed.) Citation

Lawrence, D. H., Aldington, R., & Huxley, A. (1950). Selected letters. Penguin Books.

Chicago Style (17th ed.) Citation

Lawrence, D. H., Richard Aldington, and Aldous Huxley. Selected Letters. Penguin Books, 1950.

MLA (9th ed.) Citation

Lawrence, D. H., et al. Selected Letters. Penguin Books, 1950.