APA (7th ed.) Citation

Boffey, J., Edwards, A. S. G., & British Library. (2005). A new index of Middle English verse. British Library.

Chicago Style (17th ed.) Citation

Boffey, Julia, A. S. G. Edwards, and British Library. A New Index of Middle English Verse. London: British Library, 2005.

MLA (8th ed.) Citation

Boffey, Julia, et al. A New Index of Middle English Verse. British Library, 2005.