Gaya APA
Duncan, D, E. (1998).
The Calendar: The 5000-Year Struggle to Align the Clock and the Heavens .
London:
Fourth Estate.
Gaya MLA
Duncan, David, Ewing.
"The Calendar: The 5000-Year Struggle to Align the Clock and the Heavens".
London:
Fourth Estate,
1998.
Text.