OKALEBO, J. (1993). Laboratory Methods Of Soil And Plant Analysis/j. Robert Okalebo And Kenneth W. Gathua. UNESCO-ROSTA.
Lua i Stíl Chicago (17ú heag.)OKALEBO, J.R. Laboratory Methods Of Soil And Plant Analysis/j. Robert Okalebo And Kenneth W. Gathua. UNESCO-ROSTA, 1993.
Lua MLA (8ú heag.)OKALEBO, J.R. Laboratory Methods Of Soil And Plant Analysis/j. Robert Okalebo And Kenneth W. Gathua. UNESCO-ROSTA, 1993.
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