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References
Notes
- ↑ Miller, Carol Bishop (May 1, 2007). "A GARDENING LIFE: Michael A. Dirr". Horticulture Mag. Retrieved October 22, 2011.
- ↑ Dirr, Michael (2011). Dirr's Encyclopedia of Trees &Shrubs. Portland, OR: Timber Pres. ISBN 978-0881929010.
- ↑ "Dirr Bio" (PDF). The Gardeners Of America / Men's Garden Clubs of America. 2003. Retrieved October 22, 2011.
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