The phrase "a worthwhile source of" is correct and usable in written English.
You can use it when referring to something that is beneficial or useful. For example: "The library was a worthwhile source of information for my research project."
The analysis of hydrocarbons in chert rocks provides a worthwhile source of information regarding the geochemical features of a depositional setting.
Below the spermaceti organ lies the "junk" (so-called because many whalers dismissed this part as a worthwhile source of oil), which consists of compartments of spermaceti separated by cartilage.
Our results indicate that egg yolk proteins also may be a worthwhile source of peptides with α-glucosidase and DPP-IV inhibitory activity.
With 40 million users, he says, "it's a worthwhile source".
ARM also has a worthwhile chunk of it.
Too bad about that – but a worthwhile sacrifice, of course.
In this context it is worthwhile to discuss that Kupffer cells in the liver are a major source of the inflammatory cytokines upon hepatotoxic insult [ 60].
It is really worthwhile to get in contact with other Marie Curie fellows or ex-fellows, as they are a great source of help and valuable information.
This issue is often a source of confusion, so it is worthwhile to be explicit here, using our SN2 example.
It is worthwhile to address the "raw material" that may have served as a source of novel proteins for OXPHOS complexes and the mitoribosome.
Just as candidates' appeal is different from their stated platform, it's worthwhile to consider the source of a movie's power over a wide range of individual imaginations (often called, oxymoronically, the public imagination).
