American universities also have literature databases. For example, China HowNet is a Chinese database, and they have a foreign database. Some schools even buy Chinese databases, and the United States has Chinese database mirror stations.

Their databases are well-known as ELSEVIER series database in the Netherlands, Springer full-text database in Germany, Cambridge periodical online database in the UK, as well as nature Publishing Group, EBSCO full-text database, ProQuest full-text periodical database, PubMed Central and other types.

Literature can be simply searched by Google Academic. For advanced students, web of science, EI database and secondary citation database will be used, and his university library will also have a retrieval platform. You need an account to log in to the database, otherwise you can't have download permission.