Żelazny JW. Muhammad as a heresiarch in the opinion of Christian authors to John of Damascus. In: Brzozowska ZA, Leszka MJ, Marinow K, Wolińska T, eds. Phantom of Muhammad, Shade of Samuel Byzantine Empire in Relation to Members of Other Cultures and Religions (7th–15th c.): No. XXXIX. Byzantina Lodziensia. Lodz University Press; 2020:279-288. doi:10.18778/8142-804-0.15