The newest information of a certain field of science is often found in the articles of peer-reviewed scientific journals. All the articles published in these journals have gone through a close scrutiny and approval of the experts of the individual field of science.
The resource guides contain, for example, links to reference and full text article databases by different publishers, so they are very useful at the early stages of your information seeking. Reference databases allow you also to search for new material quickly by using different referencing and citation links.
As Web of Science and Scopus databases thoroughly select the publications they index, the indexes can also be considered as quality recommendations for the materials. They also serve as a central measuring tool for the impact of publications.