Library statistics :  a handbook of concepts, definitions and terminology / 
Joel Williams, director. 
 - Chicago, Ill. :  American Library Association,  1966. 
 - xv, 160 p. :  illus. ;  24 cm. 
<br/><br/>Bibliography : p. 153-154. 
<br/><br/><label>LCCN: </label>66-022724 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library statistics.