Cheney, C. R., Cheney, M. G., & Innozenz, I. (1967). The letters of Pope Innocent III (1198 - 1216) concerning England and Wales: A calendar with an app. of texts. Clarendon Press.
Chicago Style (17th ed.) CitationCheney, Christopher R., Mary G. Cheney, and III Innozenz. The Letters of Pope Innocent III (1198 - 1216) Concerning England and Wales: A Calendar with an App. of Texts. Oxford [u.a.]: Clarendon Press, 1967.
MLA (8th ed.) CitationCheney, Christopher R., et al. The Letters of Pope Innocent III (1198 - 1216) Concerning England and Wales: A Calendar with an App. of Texts. Clarendon Press, 1967.
Warning: These citations may not always be 100% accurate.