1. Anon. 1970. Atlas história geográfico y de paisajes peruanos. Instituto Nacional de Planificatión, Lima, Perú. 737 p.
2. Calvert, E. L. 1968. The reaction of potato viruses to potato mop-top virus. Rec. Agric. Res. Minist. Agric. Nth. Ir. 17:31–40.
3. Calvert, E. L. and B. D. Harrison. 1966. Potato mop-top, a soil-borne virus. Plant Pathology 15: 134–139.
4. Cooper, J. I. and B. D. Harrison. 1973. Distribution of potato mop-top virus in Scotland in relation to soil and climate. Plant Pathology 22: 73–78.
5. Fribourg, C. E. and L. F. Salazar. 1972. Newly detected potato viruses in Peru. In Prospects for the potato in the developing world. E. R. French ed., International Potato Center, Lima, Peru. pp. 230–233.