Informers : policing, policy, practice / edited by Roger Billingsley, Teresa Nemitz and Philip Bean Billingsley, Roger jt ed. Nemitz, Teresa jt ed. Bean, Philip jt ed. Criminal investigation Informers 363.252 INF Includes bibliographical references and index. New Delhi : Lawman, 2001. 2003. 2001. 2003. 2001 Text xi, 179 p. : eng