Benware, W. A. (1974). The study of Indo-European vocalism in the 19th century: From the beginnings to Whitney and Scherer : a critical-historical account. John Benjamins Pub..

Benware, Wilbur A. The Study of Indo-European Vocalism in the 19th Century: From the Beginnings to Whitney and Scherer : A Critical-historical Account. Amsterdam: John Benjamins Pub., 1974.

Benware, Wilbur A. The Study of Indo-European Vocalism in the 19th Century: From the Beginnings to Whitney and Scherer : A Critical-historical Account. John Benjamins Pub., 1974.