APA

United States, . (1991). Capitol police: Administrative improvements and possible merger with the Library of Congress Police. [Washington, D.C: .

Chicago

United States, . 1991. Capitol police: Administrative improvements and possible merger with the Library of Congress Police. [Washington, D.C: .

Harvard

United States, . (1991). Capitol police: Administrative improvements and possible merger with the Library of Congress Police. [Washington, D.C: .

MLA

United States, . Capitol police: Administrative improvements and possible merger with the Library of Congress Police. [Washington, D.C: . 1991.