Wiksell, Wesley A. Do they understand you? A guide to effective oral communication. / Illus. [by] Sam Heidelberg. - New York : Macmillan , [1960] . - ix, 200 p. : illus. ; 22 cm. Index present. Subjects--Topical Terms: Communication in management.Oral communication. Dewey Class. No.: 658.45 / WID 1960