《旧唐书·列传·卷四十》
长安四年，杨再思以他原有官职又检校京兆府长史，又迁任扬州大都督府长史。
长安四年，以本官检校京兆府长史，又迁检校扬州大都督府长史。
In the fourth year of the Chang'an reign, Yang Zaisi was given his original official position and concurrently served as assistant governor of Jingzhao Prefecture. He was later promoted to assistant governor of the Yangzhou Metropolitan Protectorate.