@book{102066,
	author = {Pirenne, Henri and Echavarría, Salvador},
	title = {Historia económica y social de la Edad Media},
	publisher = {Fondo de Cultura Económica},
	year = {[1952]},
	address = {México},
	edition = {2. ed.},
	note = {First appeared in "Histoire du moyen âge" by Henri Pirenne, Gustave Cohen, and Henri Focilon (v. 8: La civilisation occidentale au moyen âge du XIe au milieu du XVe siècle)}
}