(1969). Annual Historical Summary, Defense Documentation Center, 1 July 1968 to 30 June 1969.
Citazione stile Chigago Style (17a edizione)Annual Historical Summary, Defense Documentation Center, 1 July 1968 to 30 June 1969. 1969.
Citatione MLA (9a ed.)Annual Historical Summary, Defense Documentation Center, 1 July 1968 to 30 June 1969. 1969.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.