Constantelos, Demetrios J. Understanding the Greek Orthodox church : its faith, history and practice / Demetrios J. Constantelos. - New York : Seabury Press, 1982 - xiii, 178 p. ; 22 cm. Open access. ISBN: 0816405158 LCCN: 8121313 Subjects--Topical Terms: Orthodox--Eastern Church.Orthodoxos Ekklesia tes Hellados.