1. Library: Library is one of the main ways to obtain the full text of literature. Many libraries subscribe to a large number of academic journals and databases, providing rich literature resources. Students and teachers can read electronic documents through the lending service of the library or in the library.

2. Academic database: Academic database is an online platform containing a large number of academic journals, conference papers, dissertations and other literature resources. Common academic databases include WebofScience, Scopus and CNKI (China HowNet). Users can download the full text through keyword search.

3. Open access: Open access refers to a way for authors or publishers to provide academic literature to the public free of charge. Many academic journals and institutions provide open access services, and users can directly access and download the full text. Some well-known open access platforms include PubMedCentral, arXiv, GoogleScholar, etc.

4. Mutual aid platform: A mutual aid platform is a way for users to share literature resources. For example, ResearchGate is a social platform for scientific research, where users can post help information and other users can help provide the full text of the required literature.

5. Contact with the author: If the full text of the literature cannot be obtained through the above channels, you can try to contact the author directly. Authors are usually willing to provide their own research results, especially academic researchers.