@book{18051,
	author = {Delgado Bustamante, Pedro Abelardo.},
	title = {Estudio preliminar del estado nutricional de dos huertoos de tejocote (Crataegus pubescens H.B.K.)},
	publisher = {El Autor,},
	year = {1983},
	address = {Chapingo, Méx. :}
}