Ktsoyan, A. S., & Derderian, V. (1969). Mkhitar Heratsi: XII century physician : (In commemoration of the 850th anniversary). Hayastan.

Ktsoyan, Artsrun Sargisi, and V.S Derderian. Mkhitar Heratsi: XII Century Physician : (In Commemoration of the 850th Anniversary). Yerevan: Hayastan, 1969.

Ktsoyan, Artsrun Sargisi, and V.S Derderian. Mkhitar Heratsi: XII Century Physician : (In Commemoration of the 850th Anniversary). Hayastan, 1969.