International Plant Nutrition Institute. (2015). Informações Agronômicas. Instituto Internacional da Potassa.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিInternational Plant Nutrition Institute. Informações Agronômicas. Piracicaba: Instituto Internacional da Potassa, 2015.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিInternational Plant Nutrition Institute. Informações Agronômicas. Instituto Internacional da Potassa, 2015.
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