Read, L. E. (1975). Castles in the air. Foundation for Economic Education.
芝加哥风格引文Read, Leonard Edward. Castles in the Air. Irvington-on-Hudson, N.Y.: Foundation for Economic Education, 1975.
MLA引文Read, Leonard Edward. Castles in the Air. Foundation for Economic Education, 1975.
警告：这些引文格式不一定是100％准确.