Not to be flippant, but ...http://www.indiegogo.com/projects/lotfp-hardcover-referee-book
You need the official material man, not much else is out there. There is a Ref screen coming on the Indiegogo campaign.
Also, the official LotFP site has the core rulebook free of charge if you are missing that.
Yeah I've got the books here. Was just hoping that some homebrewed reference sheets were out there that I could slip into my ref screen.