(1891). Vermont state Agricultural experiment station: научное издание. Bulletin No 23, march 1891, Analyses of Fertilizers Licensed for Sale in the State of Vermont in the Year 1891.
Παραπομπή σε μορφή Chicago (17η εκδ.)Vermont State Agricultural Experiment Station: научное издание. Bulletin No 23, March 1891, Analyses of Fertilizers Licensed for Sale in the State of Vermont in the Year 1891. 1891.
Παραπομπή σε μορφή MLA (9th εκδ.)Vermont State Agricultural Experiment Station: научное издание. Bulletin No 23, March 1891, Analyses of Fertilizers Licensed for Sale in the State of Vermont in the Year 1891. 1891.
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