@book{58259,
	author = {Prior, R. N. B. and Gran Bretaña. Ministry of Agriculture, Fisheries and Food.},
	title = {Key for the fiel identification of apterous and alate cereal aphids with photographic ilustrations},
	publisher = {Ministry of Agriculture, Fisheries and Food,},
	year = {1975},
	address = {Middlesex, England :}
}