APA (7th ed.) Citation

Blake, W., & Keynes, G. (1956). The letters of William Blake. Hart-Davis.

Chicago Style (17th ed.) Citation

Blake, William, and Geoffrey Keynes. The Letters of William Blake. London: Hart-Davis, 1956.

MLA (8th ed.) Citation

Blake, William, and Geoffrey Keynes. The Letters of William Blake. Hart-Davis, 1956.