Figure out what speaks to their motivations, and fears. From the resources recommended, evaluate against your understanding of the folks you are trying to help.

It could be that Thank God for Bitcoin is it, or an history/economics book in saifedean or lyn alden. .

Maybe they are into dergigi essays, or Jeff Booth primer on deflation. 

Note that all these are in paper, audio, and/or video form. Everyone has a preference on medium.