Search scope resource links

http://blogs.technet.com/b/mspfe/archive/2013/02/01/how-query-rules-and-result-sources-can-be-used-to-customize-search-results.aspx

http://techmikael.blogspot.com/2013/04/limiting-search-results-in-sharepoint.html

http://blogs.msdn.com/b/nadeemis/archive/2012/08/24/sharepoint-2013-search-rest-api.aspx