APA (7th ed.) Citation

Lawrence, D. H., Boulton, J. T., & Sagar, K. (1993). The letters of D.H. Lawrence. University Press.

Chicago Style (17th ed.) Citation

Lawrence, D. H., James Thompson Boulton, and Keith Sagar. The Letters of D.H. Lawrence. Cambridge [etc.]: University Press, 1993.

MLA (9th ed.) Citation

Lawrence, D. H., et al. The Letters of D.H. Lawrence. University Press, 1993.