Blackstock, Paul W. <br/><br/>
Intelligence, espionage, counterespionage, and covert operations :  a guide to information sources / 
Paul W. Blackstock, Frank L. Schaf, Jr. 
 - Detroit, Mich. :  Gale Research Co.,  1978 
 - xv, 255 p. ;  23 cm. 
<br/><br/> Includes indexes. 
<br/><br/><label>ISBN: </label>0810313235 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intelligence service--Bibliography.<br/>Espionage--Bibliography.<br/>Subversive activities--Bibliography.