Não informado. (1950). Tohoku journal of agricultural research. Tohoku University, Faculty of Agriculture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Tohoku Journal of Agricultural Research. Sendai, Japão: Tohoku University, Faculty of Agriculture, 1950.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Tohoku Journal of Agricultural Research. Tohoku University, Faculty of Agriculture, 1950.
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