Online searching :  principles and practice / 
by R. J. Hartley ... [et al.]. 
 - London :  Bowker-Saur,  1990. 
 - xvii, 287 p. 
<br/><br/> 1992 reprinting. 
<br/><br/><label>ISBN: </label>0408022906  
<br/><br/><label>LCCN: </label>92026250     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Database searching<br/>Online bibliographic searching