《宋史·列传·卷一百四十二》
等到陈俊卿为馆伴使时，龙大渊为副职，陈俊卿在外面见到他，不与他说一句话，龙大渊呈上名片请求接见，陈俊卿也谢绝不见。
及俊卿馆伴，大渊副之，公见外，不交一语，大渊纳谒，亦谢不接。
When Chen Junqing was the companion of the embassy, Long Dayuan was his deputy. When Chen Junqing saw him outside, he didn't say a word to him. Long Dayuan presented his business card and asked to meet him, and Chen Junqing also refused to meet him.