Norton, J. D., Boyhan, G. E., Smith, D. A., & Abrahams, B. R. New Early Season Plum Developed: AU-Rubrum Cultivar Combines High Yielding Ability with Disease Resistance and Excellent Fruit Quality. Auburn University Libraries.

Norton, J. D., George Edward Boyhan, Don A. Smith, and Bruce Ralph Abrahams. New Early Season Plum Developed: AU-Rubrum Cultivar Combines High Yielding Ability With Disease Resistance and Excellent Fruit Quality. Auburn University Libraries.

Norton, J. D., George Edward Boyhan, Don A. Smith, and Bruce Ralph Abrahams. New Early Season Plum Developed: AU-Rubrum Cultivar Combines High Yielding Ability With Disease Resistance and Excellent Fruit Quality. Auburn University Libraries.