APA (7th ed.) Citation

Duncan, D. E. (1998). The calendar : the 5000-year struggle to align the clock and the heavens, and what happened to the missing ten days / David Ewing Duncan: The 5000-year struggle to align the clock and the heavens, and what happened to the missing ten days. Fourth Estate.

Chicago Style (17th ed.) Citation

Duncan, David Ewing. The Calendar : The 5000-year Struggle to Align the Clock and the Heavens, and What Happened to the Missing Ten Days / David Ewing Duncan: The 5000-year Struggle to Align the Clock and the Heavens, and What Happened to the Missing Ten Days. London: Fourth Estate, 1998.

MLA (9th ed.) Citation

Duncan, David Ewing. The Calendar : The 5000-year Struggle to Align the Clock and the Heavens, and What Happened to the Missing Ten Days / David Ewing Duncan: The 5000-year Struggle to Align the Clock and the Heavens, and What Happened to the Missing Ten Days. Fourth Estate, 1998.

Warning: These citations may not always be 100% accurate.