Ruggiero, G. d. (1921). Modern philosophy. George Allen & Unwin.
Chicago Style (17th ed.) CitationRuggiero, Guido de. Modern Philosophy. London: George Allen & Unwin, 1921.
MLA引文Ruggiero, Guido de. Modern Philosophy. George Allen & Unwin, 1921.
警告:這些引文格式不一定是100%准確.