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Discover LudwigSuggestions(5)
'from external sources' is correct and usable in written English.
It is typically used to signify that an idea, opinion, or piece of information came from someone or something outside of the immediate context or conversation. For example, "This article presents data from external sources that suggest a global rise in median income."
Exact(60)
Water for irrigation came from external sources.
(bottom) Neurons also receive input from external sources.
The Snowden documents show GCHQ has become increasingly reliant on money from "external" sources.
In addition, we absorb synthetic hormones from external sources — cosmetics, drugs, and foods, among others.
The ability of microorganisms to accept electrons into the cell from external sources.
Now building societies, like banks, have the option of raising core tier 1 capital from external sources".
While there is no direct funding for MSc courses, students in the past have successfully gained grants from external sources.
Diseases came from external sources, such as Apollo, whose invisible arrows were thought to cause plagues.
But firms are now looking to combine data from external sources to better predict future risks.
A large portion of this big data comes from external sources as well as traditional enterprise data.
Reinforced concrete structures often demonstrate nonstructural cracking caused by the action of sulfates from external sources.
More suggestions(25)
documentation from external sources
financed from external sources
generation from external sources
gained from external sources
infection from external sources
input from external sources
from outside sources
from outer sources
from international sources
from external references
from exterior sources
from external factors
from exogenous sources
from external reservoirs
from ambient sources
from outdoor sources
from extraneous sources
from external causes
from external courses
from external supplies
from extramural sources
from external supply
from external finance
from external information
from external source
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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