Johnsen, J. (2019). Gardentopia: Design basics for creating beautiful outdoor spaces. The Countryman Press, a division of W. W. Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnsen, Jan. Gardentopia: Design Basics for Creating Beautiful Outdoor Spaces. New York, NY: The Countryman Press, a division of W. W. Norton & Company, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnsen, Jan. Gardentopia: Design Basics for Creating Beautiful Outdoor Spaces. The Countryman Press, a division of W. W. Norton & Company, 2019.
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