Freeman, Christopher. <br/><br/>
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. 
 - París :  UNESCO,  1969. 
 - 63 p. ;  il., fot. 
 - Statistical reports and studies ;  15. .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>OC 31: 5.001.5 (100)=20 FRE No.15.