There are several different versions of Classic Quotations, among which Classic Quotations is recommended by Zhonghua Book Company. This edition not only includes the original text of the book, but also adds four words in the appendix, namely, Three Hundred Tang Poems by Zhu Ziqing, On Feudalism and Preface to Reading Classics by Ye Shengtao, which is more conducive to readers' reading.
Another recommended version is Classic Talk jointly produced by Sanqin Publishing House and Guomai. This version has specially added illustrations and notes, which is more suitable for junior high school children to complete barrier-free reading.
In short, which version to choose depends on personal needs and reading level.