Saxakali.com (arkistoitu) The Mayan Numerals (1997): The data provided by Michielb, a graduate astronomy student living in The Netherlands, based on a written summary of a lecture Dawn Jenkins gave on the topic of Maya Astronomy at the February 13, 1995, at the regular meeting of the Cuyahoga Astronomical Association. --Viitattu 13. toukokuuta 2023
