Richards, E. (1998). Mapping time: The calender and its history. Oxford University.
Chicago Style aipamenaRichards, E.G. Mapping Time: The Calender and Its History. New York: Oxford University, 1998.
MLA aipamenaRichards, E.G. Mapping Time: The Calender and Its History. Oxford University, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.