@book{206973,
	author = {Ball, E.D. and Anals of the Entomological Society of America 13 (1)},
	title = {A review of the species of the genus gypona ocurring in North American North of Mexico (homoptera)  /},
	note = {Sobretiro de: Ann. Ent. Soc. Am. 13 (1): 83-100, 1920. Encuadernado con otros impresos similares}
}