Read, L. E. (1975). Castles in the air. Foundation for Economic Education.
Citazione stile Chigago Style (17a edizione)Read, Leonard Edward. Castles in the Air. Irvington-on-Hudson, N.Y.: Foundation for Economic Education, 1975.
Citatione MLA (8a ed.)Read, Leonard Edward. Castles in the Air. Foundation for Economic Education, 1975.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.