《汉书·传·东方朔传》
因而将他留在府中，教他写字、算术、相马、驾车、射箭等技巧，还让他读了些传记类的书。
因留第中，教书计相马御射，颇读传记。
Therefore, he kept Dong in his manor and taught him calligraphy, arithmetic, physiognomy for horses, driving, archery, and so on. He also made him read some biographies.