Kálmán Béla: A nevek világa (1989) 143. o. – Béla Kálmán: The world of names (1989) p. 143. Béla Kálmán wrote: "Földes got its name from its non-sandy and non-salty soil." That means: if its soil is not-sandy and non-salty then it is earthy. Earthy means "földes" in Hungarian.
A hagyományfenntartó Virágh László tanító – László Virágh, a teacher maintaining tradition. László Virágh taught to the young schoolchildren in the late 1950s that people wandering in the marshy, reedy locations of Sárrét, (Sárrét = muddy meadow) they stopped at this place and told each other: "See, here the place is earthy!"
Földes története I. (2002) Módy György 22–23. o. ISBN963-00-9274-3 – History of Földes I (2002) György Módy pp. 22–23. Out of old historians János Karácsonyi did not accept the name Heldus (mentioned in the Váradi Regestrum) as Földes's name. Gábor Herpay accepted his argument and did not link 1215 to Földes. Kabos Kandra accepted the name Heldus as Földes's name. Lajos Zoltai recommended the further consideration of the Heldus word. Today's historians: György Módy, Ilona K. Fábián and Péter Németh accept the Heldus word as the name of Földes.
Szapolyai János legfelsőbb bírói döntése 1537. V. 7. – Decision of King John Zápolya as a Supreme Justice. They punished one of their noble fellow for one florin on the basis of penalty (vinculum) because he had not paid his contribution to the Tokaj army.
Herpay Gábor: Földes község története (1936) 190. o. – Gábor Herpay: The History of Földes Village (1936) p. 190. At this time Földes was Turkish occupation area after the devastating Battle of Mezőkeresztes (1596). Data can be found only about those who moved to Debrecen.
Népszámlálás (2011) Központi Statisztikai Hivatal; Hajdú-Bihar megye; A népesség számának alakulása, terület, népsűrűség; Földes 141. o. – Census (2011); Central Statistics Office; Hajdú-Bihar County; Changes in population, area, population density; Földes p.141.
Népszámlálás (2011) Központi Statisztikai Hivatal; Hajdú-Bihar megye; Népesség nemzetiség szerint; Földes 159, 162. o. – Census (2011); Central Statistics Office; Hajdú-Bihar County; Population according to nationalities; Földes pp. 159, 162.
