Houghton, B. (Bernard), 1935- <br/><br/>
On- line information retrieval systems  an introductory manual to principles and practice 
Bernard Houghton and John Convey 
 - London  Clive Bingley  1977 
 - 160 pages. ; 23 cm. 
<br/><br/><label>ISBN: </label>0208016600 
<br/><br/><label>Subjects--Topical Terms: </label><br/>On--line bibliographic searching