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UK Ministry of Agriculture, Fisheries and Food. 1989. Varroasis: a parasitic disease of honey bees. No. P834, 4 pp. (A. A. 1992, #269)
UK Ministry of Agriculture for Northern Ireland. 1973. Bee diseases. Annual report on research and technical work of the Ministry o Agriculture for Northern Ireland. Ministry of Agric. for Northern Ireland, Belfast, UK. p. 161.
USDA Quarterly Reports. 1960 to 1961 Title? Entomology Research Division, Bee Culture Research Investigations. Beltsville, MD.
USDA Quarterly Reports. 1960 to 1962; 1970. Title? Entomology Research Division, Bee Culture Research Investigations. Laramie, WY.
USDA Quarterly Reports. 1960. Title? Entomology Research Division, Bee Culture Research Investigations. Madison, WI.
