Københavns Universitets Almanak, Skriv- og Rejse-Kalender, Busck, årlige udgaver
List of Radio Signals, Vol. 2, Hydrographic Office, årlige udgaver
Man is not lost - A Record of 200 Years of Astronomical Navigation with the Nautical
Almanac, HMSO 1968
Nautisk Almanak, Weilbach, årlige udgaver
The Oxford Classical Dictionary, OUP 1949, rep. 1964, M. Cay et al. (ed.)
Haandbog i Mønt, Maal- og Vægtforhold, R. W. Bauer, Kbh. 1882, 2. udg.
Calendars, Extract from the Explanatory Supplement to the Astronomical Almanac,
L. E. Doggett, 1998
Calender for Aarene fra 601 til 2200, R. W. Bauer, Dansk Hist. Fællesf., 1971
Chronology of the Ancient World, E. J. Bickerman, Thames & Hudson 1968, rev. 1980
Bowditch - The American Practical Navigator, Pub. nr. 9, Washington, 1995 edition
Kulturhistorisk leksikon for nordisk middelalder vol. 1-21, Johannes Brøndsted et al. (ed.). 1956-1978 Rosenkilde&B.
Catholic Almanac's Guide to the Church, Matthew Bunson, Indiana, 2001.
Handbook of Dates, R. C. Cheney (ed), CUP 1945, rep. 1996.
Oxford Dictionary of the Christian Church, ed. F. L. Cross + E. A. Livingstone, OUP, 1997.
Sundials on Walls, St. J. H. Daniel, NMM 1978.
Danske Højtidsskikke, Hans Ellekilde, Schultz, 1943
The Astronomical Clock, Hampton Court Palace, Brian Hellyer et al., HMSO 1973.
New Year's Day – The Story of the Calendar, S. H. Hooke, Publ. G. Howe Ltd., 1927
Greenwich Time and the Longitude, Derek Howse, NMM / Wilson 1980, 2nd Ed. 1997.
Dictionary of Scientific Units, H. C. Jerrard & D. B. McNeill, Chapman & Hall, 6th Ed. 1992
Kyndelmisse, Børge jensen, Horsens, 1981.
Fra Runestav til Almanak, Mogens Lebech, Thejls, 1969
Kalendere - Folkelig tidsregning i Norden, Niels-Knud Liebgott, Nationalmuseet, 1973
Kronologi, Herluf Nielsen, Dansk Historisk Fællesforening, 1965
Saeculum confusionis, Erling Poulsen (Hist. Tidsskrift).
Taschenbuch der Zeitrechnung des deutschen Mittelalters und der Neuzeit, H. Grotefend, Hahnsche Buchhandlung, 1915
Time, Space and Things, B. K. Ridley, CUP 1995 (3rd ed. 1994)
Navgation in the Days of Captain Cook, E. G. R. Taylor, NMM 1974.
Salmonsens Leksikon, 2. udgave.
The Haven-Finding Art, E. G. R. Taylor, Hollis & Carter / IoN, 1956, 2nd Ed. 1971.
The Geometrical Seaman, E. G. R. Taylor & M. W. Richey, Hollis & Carter / IoN, 1962
The Art of Navigation in England in Elizabethan and Early Stuart Times, 1-3, David Waters, NMM 1978, 2nd Ed.
Science and the Techniques of Navigation in the Renaissance, D. W. Waters, NMM 1974, 2nd Ed. 1980.
From Sails to Satellites, J. E. D. Williams, OUP 1992
Navigation I af Jørgen Wittrup. Weilbach 1998
Nøgle til Almanakken, D. H. Wulff, Busck, 1881, rep. 1985 og senere
Tiden i historien, Peter Øhrstrøm et al., Den Jyske Historiker, december 1999
Tidsskrifter Journal of Navigation:
No. 2 - 1985 Astronomical Background to the International Meridian Conference of 1884 by
D. H. Sadler & G. A. Wilkins
No. 2 - 1985 Charting Background to the 1884 Conference by D. W. Haslam
Navigation News: The Time of Your Lives by Norman Bonner.
Nevil Maskelyne, the Nautical Almanac, and GMT by Derek Howse. Jan/Feb 1998
Astronomisk Tidsskrift
AST 12/1982 nr.4 Datoene som forsvant 5.-14. oktober 1582, Gustav Marthinsen,
AST 5/1983 nr. 3 Datoene var seiglivede, Gustav Marthinsen,
og Vår tidsregning og Dionysius Exiguus, Gustav Teres,
AST 3/1977 Ugekalenderen, Paul E. Kustaanheimo et al.