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The phrase "are a main source" is correct and usable in written English.
It can be used when identifying or describing something that serves as a primary origin or contributor to a particular subject or topic.
Example: "The studies conducted over the past decade are a main source of information for our research on climate change."
Alternatives: "are a primary source" or "constitute a key source."
Exact(37)
They provide multimillion-dollar subsidies that are a main source of Metro's funding.
Ergonomic requirements are a main source of semi-similarity in size ranges.
US forests are a main source for EU wood pellet imports, which have been rising as demand has grown.
Fish from aquaculture are a main source of protein and of great economic importance in both rural and urban areas.
Herbicides are a main source of agricultural diffuse pollution due to their wide application in tillage practices.
Good computer systems are a main source of a bank's competitive strength, so doing a decent job of combining systems is crucial.
Similar(23)
These are a main sources of storage and propagation of the bacterium, which is spread through minuscule water droplets.
The fund is a main source for financing.
Court appointments have long been a main source of patronage for the politically connected.
Agriculture is a main source of income for rural communities in many developing countries.
The Entry Center, conveniently located in the lobby, is a main source for campus information.
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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