SCALIGER, Josephus Justus. Opus de emendatione temporum hac postrema Editione, ex Auctoris ipsius manuscripto, emendatius, magnaque accessione auctius. [s.l.]: Roverianus, 1629. Dostupné online. S. 361. (latinsky)
web.archive.org
Calendar date to Julian date/Julian date to Calendar date [online]. Astronomical Applications Department, U.S. Naval Observatory, rev. 2007-09-12 [cit. 2022-02-21]. Dostupné v archivu pořízeném dne 2007-10-06. (anglicky)