By Shannon, Claude E..
Urbana University of Illinois Press 1949 .
v (i.e. vii), 117 p. , "The first paper is reprinted from the Bell System technical journal, July and October, 1948 ... The second ... appeared [in condensed form] in Scientific American July, 1949."

By Shannon, Claude E..
Princeton . Princeton University Press 1956 .
viii, 285 p.