Sing,B P et al. (1982). Current trends in plant virology: Proceedings of group discussion on plant virology held at national botanical research institute, Lucknow, february 8-9, 1980. Today and Tomarrow`s Printers and Publishers.

Sing,B P et al. Current Trends in Plant Virology: Proceedings of Group Discussion on Plant Virology Held at National Botanical Research Institute, Lucknow, February 8-9, 1980. New Delhi: Today and Tomarrow`s Printers and Publishers, 1982.

Sing,B P et al. Current Trends in Plant Virology: Proceedings of Group Discussion on Plant Virology Held at National Botanical Research Institute, Lucknow, February 8-9, 1980. Today and Tomarrow`s Printers and Publishers, 1982.