《徐霞客游记·粤西游日记七》
此时顾仆在下洞的桥头等了很久，下来之后，走过桥将向西赶去屏风山，打算再去抄录《程公岩记》及《壶天观铭序》。
时顾仆待下洞桥端甚久，既下，越桥将西趋屏风山，欲更录《程公岩记》并《壶天铭序》。
At this time, Gu Pu had been waiting at the bridgehead of the lower cave for a long time. After coming down, he crossed the bridge and headed west to Pingfeng Mountain, planning to go and copy the "Cheng Gongyan Record" and the "Hutongguan Inscription Preface."