Ayer, A. J. (1984). Philosophy in the twentieth century. London: Counterpoint.
Trích dẫn kiểu ChicagoAyer, A. J. Philosophy in the Twentieth Century. London: Counterpoint, 1984.
MLA引文Ayer, A. J. Philosophy in the Twentieth Century. London: Counterpoint, 1984.
警告：這些引文格式不一定是100％准確.