《资治通鉴·周纪·周纪三》
其中有一个人，名为公孙龙，擅长 坚白同异 的辩论，平原君以对待客人的方式来对他。
有公孙龙者，善为坚白同异之辩，平原君客之。
Among them was a man named Gongsunlong, who was good at arguments that assert that "black is white and different are the same", and Lord Pingyuan treated him with great courtesy.