《汉书·传·杜周传》
将军辅政，应沿袭始初隆重礼仪，建立九女之制，慎重选择礼仪之家，求贤女之品质，不必具有色声技能，便可以为万世树立榜样。
将军辅政，宜因始初之隆，建九女之制，详择有行义之家，求淑女之质，毋必有色声音技能，为万世大法。
To assist in governance the general should follow initial grand rituals, establish the system of nine women, choose ritual families with care, seek women of quality, do not seek those skilled at music or dance, and this will provide a model for future imperial generations.