Pritchard, J. A. T., <br/><br/>
Introduction to on-line systems 
by J. A. T. Pritchard 
 - Manchester  NCC Publications  1973 
 - 100 p. ; 22 cm. 
<br/><br/>Bibliography: p. 95. 
<br/><br/><label>ISBN: </label>0850120888 
<br/><br/><label>Subjects--Topical Terms: </label><br/>On--line data processing