@book{6970,
	author = {Trens, Manuel B.},
	title = {El imperio en Chiapas :},
	publisher = {UNICACH, },
	year = {1956},
	series = {Colección facsimil},
	address = {Tuxtla Guiérrez, Chis. :},
	url = {https://www.cicy.mx/sitios/sib/doctoelectronico/6650.pdf}
}