The phrase "to source this material" means to find and obtain the material from a specific place or supplier.
Sentences with «to source this material»
His day jobs, however, provided plenty of source material for his art. (wmagazine.com)
I realised that being original was almost impossible, so I tried using what was already available as source material for my own work. (caseykaplangallery.com)
Whether they were adapted from source material in another medium, based on real life people or entirely new creations, there were plenty to celebrate in 2014. (vagrantrant.com)