Some schools and periodicals require that appendices be placed before references. They believe that the appendix is a supplement to the main content, including some important data, charts, formulas and so on. Putting the appendix before the reference can help readers find relevant supplementary materials conveniently when reading the text, so as to better understand the content of the paper.

Other schools and periodicals put appendices after references. They believe that the appendix is an extension and supplement to the main content, including some supplementary materials, original data and detailed derivation process. Putting the appendix after the reference can keep the logical structure and integrity of the paper and make the reference the end and summary of the main content.

Whether the appendix is placed before or after the reference, the author of the paper should follow the academic norms and periodical requirements in the writing process. When writing a paper, the content and function of the appendix should be clear, numbered and marked clearly.

In order to ensure the academic integrity and originality of papers, more and more academic circles have adopted the duplicate checking system. Paper duplication checking system can detect whether there is plagiarism in papers by comparing the similarity between papers and existing literature and network resources. By using the duplicate checking system, academic circles can ensure the originality and academic integrity of papers and improve the quality of academic research.