Walker, Samuel Katz, Charles M. The police in America : an introduction / [by] Samuel Walker, Charles M. Katz - 5th ed. - Boston McGraw-Hill 2005 - xxviii, 564 p.+ CD-ROM Includes index. ISBN: 72873256 Subjects--Topical Terms: Police-United States Dewey Class. No.: 363.20973 / WAL