The following are databases containing content with a focus in the subject area of education.
Once you have found a research article it is also good to see where and how the article has been quoted. This can provide information on how the theorists work has been applied in the field. Google Scholar can assist in this area as the number of times the work has been cited is list under the entry in the results list. If you have Libkey Nomad installed on your browser this will locate those articles if they are available through the library's online resources or another online entity.