Variation and evolution of the Nearctic harebells (Campanula subsect. Heterophylla)
By: by Stanwyn Shetler.
Series: Phanerogamarum monographiae -- t. 11
Publisher: J. Cramer
Place of publication: Vaduz
Number of pages: 516
Notes: Cover and spine title : Nearctic harebells.

Bibliography: p. 365-390.