Citação norma APA

(1969). Memorandum, Smith to Director, How "Permanent" is the Soviet Central Group of Forces in Czechoslovakia?, February 11, 1969, Top Secret [Umbra].

Citação norma Chicago

Memorandum, Smith to Director, How "Permanent" Is the Soviet Central Group of Forces in Czechoslovakia?, February 11, 1969, Top Secret [Umbra]. 1969.

Citação norma MLA

Memorandum, Smith to Director, How "Permanent" Is the Soviet Central Group of Forces in Czechoslovakia?, February 11, 1969, Top Secret [Umbra]. 1969.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.