APA

United States, . (2020). Global challenges and U.S. national security strategy: hearing before the Committee on Armed Services, United States Senate, One Hundred Fifteenth Congress, second session, January 25, 2018. Washington: U.S. Government Publishing Office.

Chicago

United States, . 2020. Global challenges and U.S. national security strategy: hearing before the Committee on Armed Services, United States Senate, One Hundred Fifteenth Congress, second session, January 25, 2018. Washington: U.S. Government Publishing Office.

Harvard

United States, . (2020). Global challenges and U.S. national security strategy: hearing before the Committee on Armed Services, United States Senate, One Hundred Fifteenth Congress, second session, January 25, 2018. Washington: U.S. Government Publishing Office.

MLA

United States, . Global challenges and U.S. national security strategy: hearing before the Committee on Armed Services, United States Senate, One Hundred Fifteenth Congress, second session, January 25, 2018. Washington: U.S. Government Publishing Office. 2020.