APA

Doyle C., Library of Congress, . (2018). National security letters: proposals in the 113th Congress. [Washington, D.C.]: Congressional Research Service.

Chicago

Doyle Charles, Library of Congress, . 2018. National security letters: proposals in the 113th Congress. [Washington, D.C.]: Congressional Research Service.

Harvard

Doyle C., Library of Congress, . (2018). National security letters: proposals in the 113th Congress. [Washington, D.C.]: Congressional Research Service.

MLA

Doyle Charles, Library of Congress, . National security letters: proposals in the 113th Congress. [Washington, D.C.]: Congressional Research Service. 2018.