@book{107057,
	author = {Espinoza Freire, Eudaldo Enrique,},
	title = {El problema, el objetivo, la hipótesis y las variables de la investigación /},
	publisher = {Editorial Exced,},
	year = {2022.},
	address = {Guayaquil, Ecuador :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/158135/}
}