1. Adsuar, J.: A new virus disease of papaya(Carica papaya) in Puerto Rico. - J. Agr. Univ. Puerto Rico4: 397–402, 1972.
2. BrčáK, J.: [Electron micrographs of rod-shaped viruses improved by preparing specimens from dry leaves.] In Czech. - Oehrana rostlin (Praha)8: 319–322, 1972.
3. Cook, A. A.: Virus diseases of papaya. - Ba$$ 750 (Technical) Florida agr. Exp. Sta., Univ. Florida 1972.
4. Harrison, B. D., Finch, J. T., Gibbs, A. J., Holangs, M., Shepherd, R. J., Valenta, V., Wetter, C.: Sixteen groups of plant viruses. -Virology45: 356–363, 1971.
5. Herold, F., Weibel, J.: Electron microscopic demonstration of papaya ringspot virus. - Virology18: 302–311, 1962.