Harfield, Clive <br/><br/>
Covert investigation / 
Clive Harfield [and] Karen Harfield. 
 - Oxford:   Oxford University Press,   2005.  
 - xxxii, 355 p. ;  24 cm. 
 - Plackstone's practical policing .
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>019928377X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Undercover operations--Law and legislation--Great Britain<br/>Police patrol--Surveillance operations--Great Britain
<br/><br/><label>Dewey Class. No.: </label>345.42