Ritchie, L. David. Information / L. David Ritchie. - Newbury Park : SAGE Publications, 1991. - viii, 75 p. : ill. ; 23 cm. - Communication concepts ; 2 . - Communication concepts ; 2. . Includes bibliographical references (p. 68-72) and index. ISBN: 0803939043 Subjects--Topical Terms: Communication.Information theory.