Ehninger, D., Gronbeck, B. E., & Monroe, A. H. (1979). Principles of speech communication (8th.). Scott, Foresman and co..

Ehninger, Douglas, Bruce E. Gronbeck, and Alan Houston Monroe. Principles of Speech Communication. 8th. Illinois: Scott, Foresman and co., 1979.

Ehninger, Douglas, et al. Principles of Speech Communication. 8th. Scott, Foresman and co., 1979.