The phrase "a massive source of" is correct and usable in written English.
It can be used to describe something that provides a large amount of a particular resource or information.
Example: "The ocean is a massive source of biodiversity, supporting countless species and ecosystems."
Alternatives: "a significant provider of" or "a substantial reservoir of".
There's a massive source of information available to [the students].
The exports are now a massive source of income for these supposedly greening economies.
And although it's cleaner than coal, it's still a massive source of carbon emissions.
His enthusiasm is unbridled and a massive source of bemusement for the handful of media sitting in in attendance.
The government has also scrapped bizarre loopholes in its procurement rules, which are a massive source of corruption.
The group of researchers involved concluded that mass incarceration has been a massive source of public harm.
He said if you think about the data generated by any business, the data created by these devices will be an order magnitude bigger, and he believes that for certain types of businesses scenarios, "these flying robots will be a massive sources of information".
Pleurotus eryngii is considered as the best species in the genus due to its excellence in cap and stem consistency, very long shelf life as well as acting as a massive source for a wide range of bioactive compounds than any other oyster mushroom.
Nuclear fusion technology has been planned as a future massive source of energy.
And it could miss out on a potentially massive source of new revenue.There had been speculation that Facebook was working on a phone of its own, or at least on a mobile operating system to rival Android or Apple's iOS.
Harnessing this massive source of energy looks like a no-brainer but will be a lot harder than laying a pipeline in the desert.
