1. Journal articles: This is the most common type of reference, including research papers, review articles, review articles, etc. These articles usually come from authoritative biological journals, such as Nature, Science and Cell.
2. Books: including textbooks, monographs, manuals, etc. These books usually have a comprehensive and in-depth discussion on a certain topic.
3. Conference papers: These papers are usually published at academic conferences, and their contents may involve the latest research results or cutting-edge research directions.
4. Dissertations: These papers are usually the research results of graduate students or doctoral students, including detailed research methods and results.
5. Reports and white papers: These documents usually come from government agencies, non-profit organizations or research institutions and provide the latest research and policy recommendations on a certain topic.
6. Network resources: including online databases, e-books and websites. These resources can provide a lot of biological information, but we should pay special attention to their reliability and accuracy.
7. Patents: If the research involves new technologies or methods, you can refer to relevant patent documents.
8. Regulations and standards: If the research involves biosafety, ethics and other issues, you can refer to relevant regulations and standards.
The above are several common types of references in biological papers, and the specific references need to be determined according to the theme and content of the study.