@book{231838,
	author = {Bretin Herrero, Constantino.},
	title = {100 años de seguridad social en España (1900-2000) /},
	publisher = {Editorial Dykinson, S.L.,},
	year = {2009. },
	address = {Madrid :},
	url = {https://www.digitaliapublishing.com/a/7959/}
}