APA (7th ed.) Citation

Sumption, J. (1978). The Albigensian Crusade / (by) Jonathan Sumption. Faber.

Chicago Style (17th ed.) Citation

Sumption, Jonathan. The Albigensian Crusade / (by) Jonathan Sumption. London (etc.): Faber, 1978.

MLA (9th ed.) Citation

Sumption, Jonathan. The Albigensian Crusade / (by) Jonathan Sumption. Faber, 1978.

Warning: These citations may not always be 100% accurate.