Columbia subject headings:
Church history--Early works to 1800.
Church history--Primitive and early church, ca. 30-600.
Harvard subject headings:
Church history--Primitive and early church, ca. 30-600
Sozomen, approximately 400-approximately 450. Ekklēsiastikē historia.
Princeton subject headings:
Church history--Primitive and early church, ca. 30-600.