APA (7th ed.) Citation

Houben, H., Loud, G. A., & Milburn, D. (2002). Roger II of Sicily: A ruler between East and West (1st publ.). Cambridge Univeristy Press.

Chicago Style (17th ed.) Citation

Houben, Hubert, G. A. Loud, and Diane Milburn. Roger II of Sicily: A Ruler Between East and West. 1st publ. Cambridge: Cambridge Univeristy Press, 2002.

MLA (9th ed.) Citation

Houben, Hubert, et al. Roger II of Sicily: A Ruler Between East and West. 1st publ. Cambridge Univeristy Press, 2002.