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Allen, J., Middle Egytian: an Introduction to the Language and Culture of Hieroglyphs (2010. Cambridge, Cambridge University Press): 109-111. Sydney Jones Library PJ1135.A42
Duncan, D.E., The Calendar: The 5000-Year Struggle to Align the Clock and the Heavens - And What Happened to the Missing Ten Days (1998. London, Fourth Estate): 20-23.
Gardiner, A. Egypt of the Pharaohs (1964. Oxford, Oxford University Press): 64-69. Sydney Jones Library DT83.G22
J.H. Johnson and E.F. Wente (eds), Studies in Honor of George R. Hughes, January 12, 1977 (1976. SAOC 39. Chicago, Oriental Institute): 177-184. Sydney Jones Library PJ1026.H89
Parker, R.A. The Calendars of Ancient Egypt. (1950. Studies in Ancient Oriental Civilisation No. 26. Chicago, The University of Chicago Press): esp. 7 and ch. 3. Sydney Jones Library DT74.P24
Wells, R.A. 'Astronomy', in D.B. Redford (ed.) The Oxford Encyclopedia of Ancient Egypt. (2001. Oxford. Oxford University Press): Volume 1, 145-151. Sydney Jones Library DT58.B41