Freiwald-Korth, G. San Isidoro Labrador und Santa Maria de la Cabeza, 1981: p. 6 (b. 1080, d. 1172)

Delaney, J. J. Dict. of Cath. Biog., 1961: p. 595 (Isidore the Farmer, d. 1130)

Encic. universal ilustrada Europeo-Amer., 1926: v. 28, pt. 2, p. 2065 (Isidro Labrador (San), b. 1080?) p. 2066 (d. 1130)

Bibliotheca sanctorum, 1966: v. 7, p. 954 (Isidro l'Agricoltore (sp. Isidro Labrador), b. 1080 ca., d. 1130 ca.)

New Cath. enc., 1967: v. 7, p. 672 (Isidore the Farmer St.; b. 1070, d. 5-15-1130)

Vega, Lope de. San Isidro labrador de Madrid, 2007.

The Original Catholic Encyclopedia online, viewed Nov. 13, 2014 (Isidore the Laborer, Saint; Spanish day-laborer (ca. 1070-1130); born near Madrid, about the year 1070; died May 15, 1130, at the same place. He was canonized by Gregory XV on March 12, 1622. St. Isidore is widely venerated as the patron of peasants and day-labourers. His feast is celebrated on May 15)

Wikipedia, viewed Nov. 13, 2014: Isidore the Laborer (Isidore the Farm Labourer, also known as Isidore the Farmer, (Spanish: San Isidro Labrador), (c. 1070- May 15, 1130) was a Spanish farmworker known for his piety toward the poor and animals. He is the Catholic patron saint of farmers)