Does the subject want to ask "do the charts in the paper need to be cross-referenced?" Yes Because in the paper, charts are one of the most important expressions, which can visually present research results and data and help readers understand the content of the article. However, if you simply mention the chart in the text without numbering and labeling, readers will be confused when reading. Therefore, charts need to be numbered and cross-referenced in the text. In addition to cross-referencing in the text, you can also list all charts and their page numbers in the chart directory, so that readers can quickly find the charts they need.