Your "attribution" use case might be a better fit for just using the publisher, provider, producer, or simply author or creator and sometimes the "legally accountable person" with accountablePerson

But if you just want to use a quick and dirty creditText that's fine, if indeed it's some dataset citation that has a credit or attribution string...but you could always make this better with a "Thing instead of a String" with good structure if you know it's a provider of the dataset for example then you would want to use that more specific property.

This depends on the context, since "attribution" means different things in different contexts.

Also if you didn't know, any property in Schema.org can simply use Text even though that's not readily self-evident, and doesn't have to necessarily use a Type.