Powell, James M.. "Frontmatter". Anatomy of a Crusade, 1213-1221, Philadelphia: University of Pennsylvania Press, 1987, pp. i-viii. https://doi.org/10.9783/9780812200829.fm
Powell, J. (1987). Frontmatter. In Anatomy of a Crusade, 1213-1221 (pp. i-viii). Philadelphia: University of Pennsylvania Press. https://doi.org/10.9783/9780812200829.fm
Powell, J. 1987. Frontmatter. Anatomy of a Crusade, 1213-1221. Philadelphia: University of Pennsylvania Press, pp. i-viii. https://doi.org/10.9783/9780812200829.fm
Powell, James M.. "Frontmatter" In Anatomy of a Crusade, 1213-1221, i-viii. Philadelphia: University of Pennsylvania Press, 1987. https://doi.org/10.9783/9780812200829.fm
Powell J. Frontmatter. In: Anatomy of a Crusade, 1213-1221. Philadelphia: University of Pennsylvania Press; 1987. p.i-viii. https://doi.org/10.9783/9780812200829.fm