SharePoint 2013 Search References

God References for SharePoint Search:

https://sharepoint.rackspace.com/search-tutorial

http://social.technet.microsoft.com/wiki/contents/articles/25783.sharepoint-2013-working-with-result-sources-to-limit-search-results.aspx

https://blogs.technet.microsoft.com/sharepoint_made_easy/2013/03/19/step-by-step-configuration-to-add-custom-refiners-in-the-refinement-panel-of-search-results-page-for-sharepoint-online/