@book{53577,
	author = {Westermann, G. E. G.},
	title = {The upper bajocian and lower bathonian (Jurassic) ammonite faunas of Oaxaca, Mexico and west-tethyan affinities},
	publisher = {Universidad Nacional Autónoma de México. Instituto de Geología,},
	year = {1981},
	series = {Paleontología mexicana},
	address = {México, D.F. :}
}