《资治通鉴·唐纪·唐纪三十二》
招募骑的办法，从天宝年间以后，也逐渐变化，并被荒废，应募的人都是一些市中商贩和刁猾之辈，未经过严格的训练。
其彍骑之法，天宝以后，稍亦变废，应募者皆市井负贩、无赖子弟，未尝习兵。
The methods of recruiting cavalry had changed and deteriorated gradually since the Tianbao period. Those who responded were either vendors or rogues, who did not undergo rigorous training. 