The resources for country, company or persons are the material, money, goods and other things that they have at hand and can use later to work accurately.
The source might be a person, place or a thing from which you get the particular thing like earth is source of oil, iron, coal, minerals etc.
Resources are regeneration source
Relied upon or made available for aid or support that is resource, while source is something from which anything comes forth...
Source is something organic and using that source when something is used for your own objectives that is called resource.