column with document library name

[rmgarcia]

Hi, 

I want to put in search center refiner, document library, like told in this post:

https://social.technet.microsoft.com/Forums/en-US/234e7ce6-58c8-49cc-8d4a-1553e834c7d7/add-document-...

How do I create the field document library name? what is the name of field I put in?

Thanks in advance