《资治通鉴·周纪·周纪四》
田单再使出反间计，说： 我怕燕军掘毁我们的城外坟墓，那样齐国人就寒心了。 
单又纵反间，言： 吾惧燕人掘吾城外冢墓，可为寒心！ 
Tian Dan used a counterintelligence strategy again, saying: "I'm afraid that the Yan army will destroy our tombs outside the city, and then the people of Qi will become disheartened."