> For the complete documentation index, see [llms.txt](https://overleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overleaf-pro.ayaka.space/latex/zh-tw/wen-yu-da/03-bibtex-isn-t-working-my-cite-are-showing-up-as-question-marks.md).

# BibTeX 無法運作；我的 \cite 顯示成問號（?）

這可能有多種原因：

* 你是否使用過任何 `\cite` 指令？只有在 `\cite` 主文中被
* 你是否指定了正確的 `.bib` 檔名（不含副檔名）給 `\bibliography{...}`？它區分大小寫，所以要留意拼字錯誤。
* 你是否使用 `\bibliographystyle{...}`指定了參考文獻樣式？如果該樣式不是 [TeX Live 自帶的標準樣式，](/latex/zh-tw/wen-yu-da/84-which-bibtex-styles-are-available-on-overleaf.md)你就需要將 `.bst` 檔案上傳到你的專案中。
* 你的 `.bib` 檔案中可能有語法錯誤，導致 bibtex 無法正確解析。如果是這樣，警告訊息中應該會有一些相關資訊；請依此修正，bibtex 就應該能再次讀取它們。
* 你的 `.bib` 檔案或主要 `.tex` 檔案是否位於名稱中含有空格或特殊字元的資料夾裡？主要 `.tex` 檔案應始終位於最上層，而位於名稱含有空格或特殊字元資料夾中的檔案，有時可能無法被編譯程序找到。
* 如果你已完成以上所有步驟，而引用仍然無法運作：在某些極端情況下，這也可能發生，原因在於 .log 檔中的行格式以及建置工具讀取檔案的方式。加入 `\typeout{}` 就在你的 `\bibliography{...}` 可能會有幫助。

若要進一步了解 BibTeX，請參閱我們的 [免費線上互動教學](/latex/zh-tw/geng-duo-zhu-ti/13-free-online-introduction-to-latex-part-1.md)，或看看這個 [影片教學](/latex/zh-tw/wen-yu-da/49-how-to-include-a-bibliography-using-bibtex.md) 和 [維基書籍文章](https://en.wikibooks.org/wiki/LaTeX/Bibliography_Management).


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