APA Format
Walker, Samuel;
. (1992). The police in America : introduction
/ Samuel Walker
. London : McGraw-Hill
MLA Format
Walker, Samuel;
. The police in America : introduction
/ Samuel Walker
. London : McGraw-Hill, 1992
Chicago Format
Walker, Samuel;
. The police in America : introduction
/ Samuel Walker
. London : McGraw-Hill, 1992
Australian/Harvard Format
Walker, Samuel;
. 1992. The police in America : introduction
/ Samuel Walker
. McGraw-Hill London