Darwin, C., Barrett, P. H., & Freeman, R. B. (1989). The formation of vegetable mould through the action of worms with observations on their habits. Pickering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDarwin, Charles, Paul H. Barrett, और R. B. Freeman. The Formation of Vegetable Mould Through the Action of Worms with Observations on Their Habits. London: Pickering, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDarwin, Charles, et al. The Formation of Vegetable Mould Through the Action of Worms with Observations on Their Habits. Pickering, 1989.
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