How does Google Scholar work
Google Scholar aims to rank documents the way researchers do, weighing the full text of each document, where it was published, who it was written by, as well as how often and how recently it has been cited in other scholarly literature.
Why not to use Google Scholar
Disadvantages of Using Google ScholarGoogle Scholar's coverage is is wide-ranging but not comprehensive.Google Scholar does not provide the criteria for what makes its results "scholarly".Google Scholar does not allow users to limit results to either peer reviewed or full text materials or by discipline.
Is Google Scholar more reliable
Currently Google Scholar is strongest in scientific, technical and medical disciplines thanks to partners such as PubMed, Cambridge Scientific Abstracts, and the Association for Computing Machinery.
Can PubMed be trusted
PubMed is a free and publicly available resource provided by the US National Library of Medicine. It covers the biomedical literature and, as the free version of MEDLINE, is highly authoritative.
Why is Google Scholar the best in research
Citation and Metrics
Another advantage of Google Scholar is that it provides citation information and metrics for the sources that it indexes. You can see how many times a source has been cited by other sources, and you can follow the links to see who has cited it and how.
Why not to use Google Scholar for research
It can be a research source, but should not be the only source you use. Google Scholar does not provide the criteria for what makes its results "scholarly". Results are often vary in quality and it is up to the researcher to determine which of the results are suitable for their purposes.
Why use PubMed over Google Scholar
In Google and Google Scholar, we don't know exactly what material is included, compared to PubMed where we know precisely which journals are included. Because of that you need to evaluate the sources even more thoroughly.
Why is PubMed the best
PubMed delivers a publicly available search interface for MEDLINE as well as other NLM resources, making it the premier source for biomedical literature and one of the most widely accessible resources in the world.
What is the disadvantage of PubMed
Limitations of PubMed
PubMed does not allow a detailed citation analysis (such as those available on the Web of Science). PubMed does not enable one to determine author metrics such as h index (which databases such as Scopus or Web of Science or search engines like Google Scholar provide).
