《资治通鉴·唐纪·唐纪二十三》
唐休极为熟悉边境地区的军政事务，自辽东碣石以西直至安西四镇以外绵延万里的山川险要之处，他都能记住。
休璟练习边事，自碣石以西逾四镇，绵亘万里，山川要害，皆能记之。
Tang Xiu was extremely familiar with the military and political affairs of the border regions. From the west of Liaodong’s Jieshi to the far west of the Anxi four towns, which stretched for thousands of miles, he was familiar with all the precipitous terrain and vital points.