Catholic Encyclopedia
Pope St. Eusebius, reigned for only four months, in 309 or 310, was deported, died in exile, is counted as a martyr.
Popes Through the Ages
Brief biography of Pope St. Eusebius, from the book by Joseph Brusher.
The Ecole Glossary
Short paragraph on the pontificate of Pope St. Eusebius, by Karen Rae Keck.