Freeman, Christopher. (1969). The measurement of scientific and technological activities : proposals for the collection of statistics on science and technology on an internationally uniform basis / by Christopher Freeman. Paris :: UNESCO,.
Freeman, Christopher. The measurement of scientific and technological activities : proposals for the collection of statistics on science and technology on an internationally uniform basis / by Christopher Freeman. Paris :: UNESCO,, 1969
Freeman, Christopher. The measurement of scientific and technological activities : proposals for the collection of statistics on science and technology on an internationally uniform basis / by Christopher Freeman. Paris :: UNESCO,, 1969.