GAUCH, H. G. (1973). In Organic Plant Nutrition Hugh G. Gauch. Dowden Hutchin Son & Ross.
Lua i Stíl Chicago (17ú heag.)GAUCH, Hugh G. In Organic Plant Nutrition Hugh G. Gauch. Dowden Hutchin Son & Ross, 1973.
Lua MLA (8ú heag.)GAUCH, Hugh G. In Organic Plant Nutrition Hugh G. Gauch. Dowden Hutchin Son & Ross, 1973.
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