Douglas Aircraft Company. (1977). The European charter airlines: World horizons. The Company.
Citazione stile Chigago Style (17a edizione)Douglas Aircraft Company. The European Charter Airlines: World Horizons. Long Beach, Calif: The Company, 1977.
Citatione MLA (9a ed.)Douglas Aircraft Company. The European Charter Airlines: World Horizons. The Company, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.