Note 621 — Chapter XVI · THE AZTEC CALENDAR.
Reading edition
Gomara, Conq. Mex., fol. 296-7; Sahagun, Hist. Gen., tom. ii., lib. vi., pp. 256-7; Acosta, Hist. de las Ynd., pp. 397-8; Leon y Gama, Dos Piedras, pt. i., p. 16 et seq.; Veytia, Hist. Ant. Mej., tom. i., p. 42 et seq.