Ritter, C. (1968). The essence of Plato's philosophy. Russell & Russell.
芝加哥风格引文Ritter, Constantin. The Essence of Plato's Philosophy. New York: Russell & Russell, 1968.
MLA引文Ritter, Constantin. The Essence of Plato's Philosophy. Russell & Russell, 1968.
警告：这些引文格式不一定是100％准确.