1. Beckwith, R.T., Calendar and Chronology, Jewish and Christian: Biblical, Intertestamental and Patristic Studies (Arbeiten zur Geschichte des An¬tiken Judentums und des Christentums; Leiden – New York, NY – Köln: Brill 1996).
2. Beda Venerabilis, De temporum ratione (eds. Th. Mommsen – Ch.W. Jones; Corpus Christianorum. Series Latina 123B; 1977) 427–433; English version: Bede, The Reckoning of Time (transl. F. Wallis; Translated Texts for Historians 49; Liverpool: Liverpool University Press 1999).
3. Blackburn, B. – Holford-Strevens, L., The Oxford Companion to the Year: An Exploration of Calendar Customs and Time-Reckoning (Oxford: Oxford University Press 1999).
4. Cassiodorus, Chronica (ed. Th. Mommsen; Monumenta Germaniae historica. Auctores antiquissimi 11, Chronica minora 2; Berolini 1894) 109–161.
5. Clemens Alexandrinus, Stromateis. Books 1–3 (transl. J. Ferguson; Fathers of the Church. A New Translation 83; Washington, D.C.: The Catholic University of America Press 1991).