《新五代史·世家·后蜀世家第四》
孟昶登位，没有改变年号，仍称明德，到明德五年纔改年号焉广政。
昶立，不改元，仍称明德，至五年始改元曰庆政。
Meng Chang ascended the throne and did not change the reign title. He still called it “Mingde”. It was not until the fifth year of Mingde that he changed the reign title to “Guangzheng”.