Eusebius of Caesarea: Book 6, Chapter 5 of the Ecclesiastical History, on the martyrs SS. Potamiaena and Basilides. Bigger file, includes links to footnotes.
Eusebius of Caesarea: Book 6, Chapter 5 of the Church History tells the story of St. Basilides. No notes, small file.
St. Basilides: Short paragraph on this martyr.