《旧唐书·列传·卷一百二十七》
昭宗举行过登基祭祀天地的大典后，又给杜让能晋位为司徒、太清宫使、弘文馆大学士、延资库使、诸道盐铁转运使等职，又加赐他食邑一千户。
昭宗郊礼毕，进位司徒、太清宫使、弘文馆大学士、延资库使、诸道盐铁转运等使，加食邑一千户。
After Emperor Zhaozong held a grand ceremony for the sacrifice to heaven and earth, he again promoted Du Rangneng to the positions of Situ, Taqing Palace Envoy, University Scholar of the Hongwen Museum, Yan Zi Ku Envoy, and Salt and Iron Transport Envoy for various routes, and granted him 1,000 more households as Shiyi.