Verbatim text: Sweitzer, E. M. 1971. The comparative anatomy of Ulmaceae. J. Arnold Arbor. 52: 523-585.
Author: Sweitzer, E.M.
Year: 1971
Title: The comparative anatomy of Ulmaceae
Journal: J. Arnold Arbor
Volume: 52
Pages: 523–585
BHL link: http://www.biodiversitylibrary.org/part/9117