APA (7th ed.) Citation

Blake, W., Gray, T., & Keynes, G. (1972). Water-colours illustrating the poems of Thomas Gray. J.P. O'Hara.

Chicago Style (17th ed.) Citation

Blake, William, Thomas Gray, and Geoffrey Keynes. Water-colours Illustrating the Poems of Thomas Gray. Chicago: J.P. O'Hara, 1972.

MLA (9th ed.) Citation

Blake, William, et al. Water-colours Illustrating the Poems of Thomas Gray. J.P. O'Hara, 1972.