@book{1868,
	author = {Palencia Juárez, Carlos Vinicio},
	url = {http://fausac.usac.edu.gt/tesario/tesis/T-01868.pdf},
	title = {Manual general del cultivo del hule (Hevea brasiliensis) /},
	address = {Guatemala, },
	publisher = {Universidad de San Carlos de Guatemala, Facultad de Agronomía:},
	year = {c2000.}
}