Não informado. (1987). Norwegian Journal of Agricultural Sciences. Norwegian Agricultural Advisory Centre.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Norwegian Journal of Agricultural Sciences. As, Noruega: Norwegian Agricultural Advisory Centre, 1987.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Norwegian Journal of Agricultural Sciences. Norwegian Agricultural Advisory Centre, 1987.
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