Bole, J. B., & Broeshart, H. (1981). Zinc fertilization of flooded rice: Summary of the results of the five-year FAO/IAEA co-ordinated research programme on isotope-aided micronutrient studies in rice production with special reference to zinc deficiency carried out during the years 1974 to 1979. Vienna: International Atomic Energy Agency.

Bole, J B., and H. Broeshart. Zinc Fertilization of Flooded Rice: Summary of the Results of the Five-year FAO/IAEA Co-ordinated Research Programme On Isotope-aided Micronutrient Studies in Rice Production With Special Reference to Zinc Deficiency Carried Out During the Years 1974 to 1979. Vienna: International Atomic Energy Agency, 1981.

Bole, J B., and H. Broeshart. Zinc Fertilization of Flooded Rice: Summary of the Results of the Five-year FAO/IAEA Co-ordinated Research Programme On Isotope-aided Micronutrient Studies in Rice Production With Special Reference to Zinc Deficiency Carried Out During the Years 1974 to 1979. Vienna: International Atomic Energy Agency, 1981.