The most common and most likely answer to this crossword clue is the 8 letter word POLYGENY
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Buddy explains!
The straight part
We know that "showing multiple sources" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case showing multiple sources = polygeny.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does POLYGENY mean?
POLYGENY noun- Polygenesis.
- The control of a single trait, or phenotype, by multiple genes.