Blackburn & Holford-Strevens. since AD stands for anno Domini, 'in the year of (Our) Lord'. 2003, p. 782.
CODATA Value: Planck time. The NIST Reference on Constants, Units, and Uncertainty. NIST. Retrieved October 1, 2011.
Dawson, Ian; Dawson, Patricia Ann. "Introducing Living Graphs". Retrieved 25 March 2010. from Thinking History website.
Matthiae, P. The Destruction of Old Syrian Ebla. In Matthiae, P., Pinnock, F., Nigro, L. and Peyronel, L. 2007.
Paula Fredriksen, Jesus of Nazareth, King of the Jews, Alfred A. Knopf Publishers; 1999. pages=6-7, 105-10, 232-34, 266.
The international standard for the representation of dates and times, ISO 8601, uses the Gregorian calendar. Section 3.2.1.