Não informado. (1962). Phosphorus and potassium. British Sulphur Corporation.
Lua i Stíl Chicago (17ú heag.)Não informado. Phosphorus and Potassium. London: British Sulphur Corporation, 1962.
Lua MLA (8ú heag.)Não informado. Phosphorus and Potassium. British Sulphur Corporation, 1962.
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