táng​tài​zōng​lǐ​wèi​gōng​wèn​duì

"Duke Li of Wei Answering Emperor Taizong of Tang", military treatise attributed to Li Jing 李靖[Lǐ​Jìng] and one of the Seven Military Classics of ancient China 武經七書|武经七书[Wǔ​jīng​Qī​shū]