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The phrase "direct source of" is grammatically correct and can be used in written English.
It is commonly used to describe something as the primary or main source of something else. Example: The sun is the direct source of light and warmth for our planet. In this sentence, "direct source of" is used to show that the sun is the main or primary source of light and warmth for the Earth.
Exact(60)
A paywall is a direct source of financing.
The Bible, of course, is the direct source of Jewish dietary laws.
But it is sensitive because it will deny states their most important direct source of revenue.
Previous reports have demonstrated that mitochondria can act as a direct source of ROS in human neutrophils32,42.
But Grab's triumph over Uber illustrates that size is more a consequence of success than the direct source of it.
The built environment and its users are a direct source of knowledge for design.
Studies estimate that plastic pellets ("nurdles") are the second largest direct source of microplastic pollution in the ocean by weight.
Auden seems to have been the only unquestionably major writer to use drugs in quite this way, as a direct source of energy for his work.
The direct source of trouble for Mr. Kerasiotes was his long and aggressive insistence that the project would come in on its $10.8 billion budget and on time.
The famous "Dying Warrior" from the temple of Aphaia on Aegina, carved around 480 B.C., appears to have been Moore's direct source of inspiration.
Although the new project will not be a direct source of revenue of Yahoo, it could give the company's search feature more visibility.
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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