how to use the word "sources"
the extraction of information from appropriate reference sources .
can l delete sources in this sentence. what is different between them?

Question

how to use  the word  "sources"
the  extraction  of information from appropriate reference sources   .
      can l   delete  sources in this sentence. what is different between  them?

Answer

Yes, you can. You just have to make reference plural --> references.

reference sources --> reference acts as a modifier on the noun sources
references --> reference is used as a noun meaning the same thing

In this context, there is no difference between "reference sources" and "references".

Evden çıkmadan dil öğrenme fırsatını kaçırmayın. Deneyimli dil eğitmenlerimizden oluşan seçkimize göz atın ve ilk dersinize şimdi kaydolun!