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The phrase "are a primary source" is correct and usable in written English.
You can use it when discussing types of sources in research, particularly in academic or historical contexts.
Example: "Documents from the time period, such as letters and diaries, are a primary source for understanding the events of that era."
Alternatives: "constitute a primary source" or "serve as a primary source".
Exact(56)
Hollywood and the mechanics of film fantasy are a primary source of his art.
Mechanical joints are a primary source of variability in the dynamics of built-up structures.
Myofascial trigger points (MTrP's) are a primary source of pain in patients with musculoskeletal disorders.
Mushrooms are a primary source of ET containing from 0.4 to 2.0 mg/g (dry-weight).
Here knees are not straightened and feet are not pointed; soles and thighs are a primary source of rhythm.
Bolted joints are a primary source of energy dissipation in dynamic built-up and space structures among others.
In Saudi Arabia, where women with university degrees are often confined to the home, social networks are a primary source of connection.
Similar(4)
Hip-hop is a primary source of this new music.
Smuggling is a primary source of income for many.
Sexuality is a primary source of positive experiences.
My guess from reading it that the former Mossad boss, Meir Dagan, is a primary 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