↑ Nerone Caesare Augusto Cosso Lentuol Cossil fil. Cos. VIII idus Febr(u)arius dies solis, luna XIIIIX nun(dinae) Cumis, V (idus Februarias) nun(dinae) Pompeis. Robert Hannah, "Time in Written Spaces", in: Peter Keegan, Gareth Sears, Ray Laurence (eds.), Written Space in the Latin West, 200 BC to AD 300, A&C Black, 2013,p. 89.
↑ E. G. Richards, Mapping Time, the Calendar and History, Oxford 1999. p. 269
↑ Falk, Michael (ngày 19 tháng 3 năm 1999). “Astronomical names for the days of the week”. Journal of the Royal Astronomical Society of Canada 93 (1999–06): 122–133. Bibcode:1999JRASC..93..122F.
