APA (7th ed.) Citation

Abélard, P., Héloïse, & Radice, B. (1974). The letters of Abelard and Heloise. Penguin.

Chicago Style (17th ed.) Citation

Abélard, Pierre, Héloïse, and Betty Radice. The Letters of Abelard and Heloise. Harmondsworth [etc.]: Penguin, 1974.

MLA (9th ed.) Citation

Abélard, Pierre, et al. The Letters of Abelard and Heloise. Penguin, 1974.