@book{957,
	author = {Gill, Jeff},
	title = {Essential mathematics for political and social research},
	publisher = {Cambridge University Press,},
	year = {2006},
	address = {New York, USA :},
	url = {https://itmsp.museknowledge.com/UOH?qurl=https://libros-uoh.uoh.cl/ESCUELADECIENCIASSOCIALES/ADMINISTRACIONPUBLICA/Essential-mathematics-for-political-and-social-research}
}