Michael Dirr (Dirr, Michael)

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  Dirr's Trees and Shrubs for Warm Climates: An Illustrated Encyclopedia
  by Michael Dirr
  Hardcover, Timber Pr, ISBN 088192525X (0-88192-525-X)
• 
  Hydrangeas for American Gardens
  by Michael Dirr
  Hardcover, Timber Pr, ISBN 0881926418 (0-88192-641-8)
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  Viburnums: Flowering Shrubs for Every Season
  by Michael Dirr, Bonnie L. Dirr
  Hardcover, Timber Pr, ISBN 0881928534 (0-88192-853-4)