Petri Callinicensis patriarchae Antiocheni Tractatus contra Damianum - Πέτρος Καλλίνικος Πατριάρχης Αντιοχείας 1800-1889 (Brepols University Press, 1994)
Includes Syriac text and English translation, with introduction in English. The Syriac is a translation of a lost Greek original