The phrase "are vouched for by" is correct and usable in written English.
It can be used when indicating that someone or something is supported or confirmed by another party, often in the context of credibility or trustworthiness.
Example: "The findings of the research are vouched for by several leading experts in the field."
Alternatives: "are endorsed by" or "are supported by".
How might we centralize online resources that are vouched for by other high net worth philanthropists and experts?
Perhaps so: the historical bona fides of this drama are vouched for by Professor Thomas Weber, chair in history and international affairs at the University of Aberdeen and visiting scholar at Harvard.
3 This inscription (cf. also RE VII.35) belongs to the Severan period, and repairs at that time are vouched for by brickstamps (CIL XV.3: Castris praetori(s) Aug. n). which should be attributed to this period rather than to that of M. Aurelius and Commodus.
A previously missed or wrongly excluded reference might receive a further chance for inclusion by being "vouched for", bibliographically speaking, by a sibling study that had already been included.
When he was arrested, he was vouched for by a businessman who owed him money and was released.
Some seemed unquestionably credible: Onco Link (oncolink.upenn. edu) at the University of Pennsylvania was vouched for by its address.
You can also be "vouched for" by a more established member and leave references for others based on personal experiences.
Their growing prosperity is vouched for by excavation: there are few villas that did not increase in size and luxury as corridors and wings were added or mosaics and bath blocks provided.
$18/hour: I would pay this for workers who have had both technical schooling and some experience in another wood shop and whose skills and work ethic have been vouched for by former bosses.
The online forum, one law enforcement official said, was "like a restricted eBay," open only to people who had a reputation and who had been vouched for by someone on the site.
