Bonnie L. Dirr (Dirr, Bonnie L.)

• 
  Hydrangeas for American Gardens
  by Michael Dirr
  Hardcover, Timber Pr, ISBN 0881926418 (0-88192-641-8)
• 
  The Reference Manual of Woody Plant Propagation: From Seed to Tissue Culture A Practical Working Guide to the Propagation of over 1100 Species, Va
  by Michael A. Dirr, Charles W. Heuser
  Softcover, Varsity Pr Inc, ISBN 0942375009 (0-942375-00-9)
• 
  Viburnums: Flowering Shrubs for Every Season
  by Michael Dirr, Bonnie L. Dirr
  Hardcover, Timber Pr, ISBN 0881928534 (0-88192-853-4)