“Six Secret Strategic Teachings”, one of the Seven Military Classics of ancient China 武經七書|武经七书[Wu3 jing1 Qi1 shu1], attributed to Jiang Ziya 姜子牙[Jiang1 Zi3 ya2]
"Six Secret Strategic Teachings" 六韜|六韬[Liu4 tao1] and "Three Strategies of Huang Shigong" 三略[San1 lüe4], two of the Seven Military Classics of ancient China 武經七書|武经七书[Wu3 jing1 Qi1 shu1], attributed to Jiang Ziya 姜子牙[Jiang1 Zi3 ya2]