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Theodoret's sources are in dispute.

According to Valesius these were mainly Socrates and Sozomen ; Albert Guldenpenning's thorough research placed Rufinus first, and next to him, Eusebius of Caesarea, Athanasius, Sozomen, Sabinus, Philostorgius, Gregory Nazianzen, and, least of all, Socrates.

N. Glubokovskij counts Eusebius, Rufinus, Philostorgius, and, perhaps, Sabinus.