Sahlén, K. (1992). Anatomical and physiological ripening of Pinus sylvestris L. seeds in northern Fennoscandia. Dept. of Silviculture, Swedish University of Agricultural Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSahlén, Kenneth. Anatomical and Physiological Ripening of Pinus Sylvestris L. Seeds in Northern Fennoscandia. Umeå, Sweden: Dept. of Silviculture, Swedish University of Agricultural Sciences, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSahlén, Kenneth. Anatomical and Physiological Ripening of Pinus Sylvestris L. Seeds in Northern Fennoscandia. Dept. of Silviculture, Swedish University of Agricultural Sciences, 1992.
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