- Bagnall & Bradley, Phytopathology 48: 121, 1958.
- Bartels, Proc. 3rd Conf. on Potato Virus Diseases, Lisse-Wageningen: 13, 1957.
- Bawden, Ann. appl. Biol. 23: 487, 1936.
- Bawden & Kassanis, Ann. appl. Biol. 38: 402, 1951.
- Benson & Hooker, Phytopathology 50: 231, 1960.
- Bradley, Nature, Lond. 171: 755, 1953.
- Brandes & Bercks, Adv. Virus Res. 11: 1, 1965.
- Darby, Larson & Walker, Res. Bull. Univ. Wisc. 177, 32 pp., 1951.
- Delgado-Sanchez & Grogan, Phytopathology 56: 1397, 1966.
- Easton, Larson & Hougas, Res. Bull. Univ. Wisc. 205, 32 pp., 1958.
- Edwardson, Am. J. Bot. 53: 359, 1966.
- Kahn & Monroe, Phytopathology 53: 1356, 1963.
- Kennedy, Day & Eastop, A conspectus of aphids as vectors of plant viruses, London, Commonwealth Institute of Entomology, 1962.
- Nobrega & Silberschmidt, Arquiv. Inst. Biol. S. Paulo 15: 307, 1944.
- Smith, Proc. R. Soc., B 109: 251, 1931.
- Smith, A Text Book of Plant Virus Diseases, Churchill, London, 1957.
- Thornberry, Index of Plant Virus Diseases, Agric. Handb. U.S.D.A., 307, 285, 1966.
- Van Regenmortel, Virology 23: 495, 1964.
- Varma, Gibbs, Woods & Finch, J. gen. Virol. 2: 107, 1968.
- Venekamp & Mosch, Virology 23: 394, 1964.
- Wetter, Arch. Mikrobiol. 37: 278, 1960.