APA

United States, . (2018). Challenges facing law enforcement in the 21st century: hearing before the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations of the Committee on the Judiciary, House of Representatives, One Hundred Fifteenth Congress, first session, May 17, 2017. Washington: U.S. Government Publishing Office.

Chicago

United States, . 2018. Challenges facing law enforcement in the 21st century: hearing before the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations of the Committee on the Judiciary, House of Representatives, One Hundred Fifteenth Congress, first session, May 17, 2017. Washington: U.S. Government Publishing Office.

Harvard

United States, . (2018). Challenges facing law enforcement in the 21st century: hearing before the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations of the Committee on the Judiciary, House of Representatives, One Hundred Fifteenth Congress, first session, May 17, 2017. Washington: U.S. Government Publishing Office.

MLA

United States, . Challenges facing law enforcement in the 21st century: hearing before the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations of the Committee on the Judiciary, House of Representatives, One Hundred Fifteenth Congress, first session, May 17, 2017. Washington: U.S. Government Publishing Office. 2018.