Johnson, H. (1979). The principles of gardening: The classic guide to the gardeners art. Simon and Schuster.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Hugh. The Principles of Gardening: The Classic Guide to the Gardeners Art. New York: Simon and Schuster, 1979.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJohnson, Hugh. The Principles of Gardening: The Classic Guide to the Gardeners Art. Simon and Schuster, 1979.
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