John Hemming, [1], The Conquest of the Incas (Houghton Mifflin Harcourt, 1973) p.557 (quote:"It is an extraordinary fact that the exact date of Atahualpa's execution was not known until very recently. Garcilaso [de la Vega] wrote incorrectly that the Inca was christened Don Juan Atahualpa.. Because of this Juan de Velasco assumed, in his Historia del reino de Quito... that the baptism and execution took place on 29 August, the day of St John the Baptist. William Hickling Prescott accepted this date and it has been repeated by innumerable later writers ot this day. The Spaniards had in fact marched out of Cajamarca long before 29 August.")
Enciclopedia cattolica (in Italian). Ente per l'Enciclopedia cattolica e per il Libro cattolico. 1952. p. 1835. Retrieved August 17, 2023.
Liliencron, Rochus Freiherr von; Wegele, Franz X. von; Bettelheim, Anton (1900). Allgemeine deutsche Biographie (in German). Duncker & Humblot. p. 543. Retrieved August 17, 2023.