1. Karnik Šaxyan, "Trdat," Haykakan Sovetakan Hanrakitaran(Armenian-Soviet encyclopedia) (Erevan, 1986), 93ŠaxyanTrdat93Haykakan Sovetakan Hanrakitaran1986
2. Lucy Der Manuelian,"Trdat," in Joseph R. Strayer, ed., Dictionary of the Middle Ages (New York, 1982),164-65ManuelianTrdat164Dictionary of the Middle Ages1982