National Foreign Assessment Center (U.S.). (1980). USSR, coal industry problems and prospects. Central Intelligence Agency, National Foreign Assessment Center.
Chicago (17e ed.) BronvermeldingNational Foreign Assessment Center (U.S.). USSR, Coal Industry Problems and Prospects. Washington, D.C.: Central Intelligence Agency, National Foreign Assessment Center, 1980.
MLA (8e ed.) BronvermeldingNational Foreign Assessment Center (U.S.). USSR, Coal Industry Problems and Prospects. Central Intelligence Agency, National Foreign Assessment Center, 1980.
Let op: Deze citaties zijn niet altijd 100% accuraat.