《容斋随笔·卷二·唐重牡丹》
我考查，白乐天集中有《白牡丹》一篇，共十四韵，又有《秦中吟》十篇，其中有《买花》一章，共一百字，说： 都说牡丹开花，买花人成队。
予按：白公集有《白牡丹》一篇十四韵，又《秦中吟》十篇，内《买花》一章，凡百言，云： 共道牡丹时，相随买花去。
I looked it up, and there is an article entitled "White Peony" in Bai Letian's collection, with a total of 14 rhymes, and also ten "Qinzhong Ballads", among which there is a chapter entitled "Buying Flowers" with a total of 100 characters, which says: It is said that the peony will bloom, and people buying flowers form a line.