HEYDECKER, W. Seed ecology. The Pennsylvania State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHEYDECKER, W. Seed Ecology. The Pennsylvania State University Press.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHEYDECKER, W. Seed Ecology. The Pennsylvania State University Press.
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