Gossler, R., Gossler, E., & Gossler, M. (2009). The Gossler guide to the best hardy shrubs: More than 350 expert choices for your garden. Timber Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGossler, Roger, Eric Gossler, और Marjory Gossler. The Gossler Guide to the Best Hardy Shrubs: More than 350 Expert Choices for Your Garden. Portland, Or.: Timber Press, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGossler, Roger, et al. The Gossler Guide to the Best Hardy Shrubs: More than 350 Expert Choices for Your Garden. Timber Press, 2009.
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