@book{90117,
	author = {Lehnert, Robert,},
	title = {La construccion de herramientas :},
	publisher = {Editorial Reverté,},
	year = {[2021]},
	address = {Barcelona :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/103317/}
}