There are special search engines and scientific databases, which store articles from thousands of scientific journals and books. Access to many databases is paid, but if you are a student, the university can give you free access to some of them.
• Look for specialized databases devoted specifically to your area of scientific interest (for example, in the professional essay writing services database you can find work only in psychology and sociology). So you will save time and get more specific results.
• Most databases provide the possibility of a multidimensional search by fields. Each field contains certain data parameters, for which you can find specialized materials. Try to search for the maximum possible number of suitable parameters for you. You can also customize the search for archives that contain a single type of source (for example, only articles from magazines or just newspapers).
• Go to the library of your university and ask for the passwords to enter into all the scientific databases for which the university was signed.
If you find a really useful book or magazine in which your topic is covered in detail, see what sources are indicated in the bibliography. There you can find other books and magazines devoted to the subject of your study.