PsycINFO has many useful search filters. You will need to scroll down to find them.
Scopus, the database, allows you to sort your search results by the number of times an article is cited.
1. Google Scholar gives you the number of times an article is cited. Unfortunately, you cannot list search results by the number of times, an article is cited in Google Scholar. This makes Google Scholar less effective for citation searches.
Notice that the same article by George B.Graen and Mary Uhl-Bien entitled “Relationship-based approach to leadership: Development of leader-member exchange (LMX) theory of leadership over 25 years: Applying a multi-level multi-domain perspective” reports a different citation count when you compare the results between Scopus and Google Scholar.