Gw mau tau Catatan dari Kronologi. Jelasin dalam bahasa melayu

Hegewisch, D. H., & Marsh, J. (1837). Introduction to historical chronology. Burlington [Vt.]: C. Goodrich.

B. E. Tumanian, “Measurement of Time in Ancient and Medieval Armenia,” Journal for the History of Astronomy 5, 1974, pp. 91–98.

Kazarian, K. A., “History of Chronology by B. E. Tumanian,” Journal for the History of Astronomy, 4, 1973, p. 137

Porter, T. M., "The Dynamics of Progress: Time, Method, and Measure". The American Historical Review, 1991.