Não informado. (2000). Technical bulletin. Institute for Land and Water Management Research.
Lua i Stíl Chicago (17ú heag.)Não informado. Technical Bulletin. Wageningen, Holanda: Institute for Land and Water Management Research, 2000.
Lua MLA (8ú heag.)Não informado. Technical Bulletin. Institute for Land and Water Management Research, 2000.
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