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"external sources" is a correct and usable phrase in written English.
You can use it when you are referring to information that has come from outside of your own organisation or knowledge base. For example, "Our team consulted external sources to obtain further information about the project."
Exact(58)
The Snowden documents show GCHQ has become increasingly reliant on money from "external" sources.
If space, quote both the researchers themselves and external sources with appropriate expertise.
Chris Cross is working with the football data we have from our external sources.
In addition, we absorb synthetic hormones from external sources — cosmetics, drugs, and foods, among others.
Feel free to link to as many external sources or websites as you like.
Accessing external sources of funds will not mark the end of Ireland's troubles.
External sources of stress might include bullying, disruptive colleagues or family problems.
Electromagnetic interference, both from internal and external sources, can also play havoc with equipment.
And I imagine that solver finishing the crossword without recourse to external sources of information.
Now building societies, like banks, have the option of raising core tier 1 capital from external sources".
Similar(1)
Many teens turn to external sources--friends, family, hobbies.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com