There are two different ways to see how many times an article has been cited in Web of Science:
Basic Search
1- Conduct a search by article Title OR a combination of Title Keywords and Journal Titles
2- On the Right-hand side of the screen you will see the number of Times Cited
3- Click on the number to see all articles in Web of Science
There are two different ways to see how many times an article has been cited in Web of Science:
Cited Reference Search
1- From the drop-down menu select "Cited Reference Search"
2- Enter in the Title of the article and select "title" from the drop-down field. Alternatively, use a combination of Author information and Journal information.
3- Verify and include any variants and variations to the Journal Citation and include them in the search
4- Click "Finish Search"
5- All of the articles citing the original work will be retrieved.
It is very likely that google Scholar will retrieve a larger citation count compared to Web of Science since it also indexes Books, conference proceedings, patents, presentations, etc.
That said, Google Scholar's numbers might be incredibly inflated as there are many duplications and errors.
Using Google Scholar
1- Do a search for the article. Use quotations " " to conduct a phrase search
2- Under the retrieved article, you will find a Cited by number
3- Click on "Cited by"
iCite is a tool to access a dashboard of bibliometrics for papers associated with a portfolio. Users upload the PubMed IDs of articles of interest (from SPIRES or PubMed), optionally grouping them for comparison. iCite then displays the number of articles, articles per year, citations per year, and Relative Citation Ratio (a field-normalized metric that shows the citation impact of one or more articles relative to the average NIH-funded paper). A range of years can be selected, as well as article type (all, or only research articles), and individual articles can be toggled on and off. Users can download a report table with the article-level detail for later use or further visualization. Read about how the Relative Citation Ratio (RCR) is calculated at PLOS Biology. (Source: iCite, 2016)
Many other databases allow you to view how many times a specific article has been cited within the confines of that database.In each database, conduct a search for an article and look for "Cited by", "Citings", or "Related Articles"