@book{57528,
	author = {Sporne, K. R. and Zavala Chávez, Fernando.},
	title = {Morfología de gimnospermas},
	publisher = {UACH. Departamento de Bosques,},
	year = {1982},
	series = {Boletín técnico},
	address = {Chapingo, Méx. :}
}