References, in the copyright law, refer to the relevant books and materials cited in writing or editing works, which are called references. References are an indispensable part of publications. All opinions, data and materials quoted by predecessors or others should be marked where they appear in the text and listed at the end of the text or book. This work is called reference.

Books in a narrow sense are a collection of words and images. Broadly speaking, it can be considered as all media that disseminate information.

At present, there are many websites about academic resources, among which Nobel Academic Resources Network is a very good professional website, providing domestic and foreign literature retrieval resources, literature agency, literature mutual assistance and so on. All the literature resources are free. There are also many academic exchange areas, where enthusiasts and experts in various fields can provide you with suggestions on academic research and production practice and share various experiences.

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Just try it. Good luck.