APA (7th ed.) Citation

British Library, Grenville, G., Grenville, E., & Temple, R. G. (1716). The papers of George Grenville.

Chicago Style (17th ed.) Citation

British Library, George Grenville, Elizabeth Grenville, and Richard Grenville-Temple Temple. The Papers of George Grenville. 1716.

MLA (8th ed.) Citation

British Library, et al. The Papers of George Grenville. 1716.