ARNTZEN, C. J. Encyclopedia of agricultural science. Vol.2: E-L. Academic Press.
Lua i Stíl Chicago (17ú heag.)ARNTZEN, Charles J. Encyclopedia of Agricultural Science. Vol.2: E-L. Academic Press.
Lua MLA (8ú heag.)ARNTZEN, Charles J. Encyclopedia of Agricultural Science. Vol.2: E-L. Academic Press.
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