TY  - BOOK
AU  - Harfield, Clive
AU  - Harfield, Karen
TI  - Covert investigation
SN  - 9780199549627
SN  - 200804374
U1  - 344.4105232 HAR 
PY  - 2008///
CY  - Oxford
PB  - Oxford University Press
KW  - Police patrol - Great Britain - Surveillance operations
KW  - Undercover operations - Law and legislation - Great Britain
N1  - Includes bibliographical references and index
ER  -