《资治通鉴·唐纪·唐纪二十九》
不久，苏禄听说杜暹当了宰相，才逐渐地将军队撤走，随即又派使者向唐朝进献贡品。
既而苏禄闻暹入相，稍引退，寻遣使入贡。
Soon, Su Lu heard that Du Xian had become the prime minister, so he gradually withdrew his troops and immediately sent an envoy to pay tribute to the Tang Dynasty.