Explanation/Reference:
Note:
* From scenario:
Allow resource coordinators from Blue Yonder to find temporary staffing options from Margie's Travel contractors and employees.
* To create a result source
Depending on the level at which you want to create the result source, do one of the following:

- To create a result source for a Search service application:
- Verify that the user account that performs this procedure is an administrator on the Search service application.
- In Central Administration, in the Application Management section, click Manage service application.
- Click the Search service application for which you want to create a result source.
- On the Search Administration page for the Search service application, on the Quick Launch, in the Queries and Results section, click Result Sources.
* In theTypesection, selectSharePoint Search Resultsto search the whole index, orPeople Search Resultsto enable query processing that is specific to people search.
Reference: Configure result sources for search in SharePoint Server 2013