APA (7th ed.) Citation

Gutiérrez, L. Holy wars in history: A preamble to the crusades.

Chicago Style (17th ed.) Citation

Gutiérrez, Lucio. Holy Wars in History: A Preamble to the Crusades.

MLA (9th ed.) Citation

Gutiérrez, Lucio. Holy Wars in History: A Preamble to the Crusades.

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