"classic case study" is a correct and usable phrase in written English.
You can use it to refer to a well-known example or a timeless study from which many are drawn. For example, "Freud's psychoanalytic study of Little Hans is a classic case study in psychiatry."
If elections test what the role of government should be, this is a classic case study.
But Mary Anne is not a classic case study of the abuse victim: there's something rotten in her character as well.
How a company that once defined the smartphone messed up so badly is likely to become a classic case study for business schools around the world.
If you do, she will be displeased, and Hedda is the classic case study of a woman who doesn't forget and doesn't forgive.
In this classic case study, Russian neuropsychologist Luria tells the story of his patient S. (Solomon Shereshevsky) who harnessed his synaesthetic powers to perform preternatural feats of remembering.
Instead, it put that part of its business into a joint venture with Sony.This has become a classic case study for supply-chain experts and risk consultants.
In his illuminating new book, the journalist Jonah Lehrer explicates some now classic case studies.
The results of classic case studies showed that many key issues in slope analysis could be well solved within the framework of the DRT.
Claudia Hammond revisits the classic case studies that have advanced psychological research.
The young man has a communications crisis on his hands, and it is nothing like any of the classic case studies covered in a PR course syllabus.
It's not their fault, most of them still hear the word disruption and think of the classic case studies, you know, where IBM didn't see the shift from mainframes to PCs and therefore was disrupted or where the movie theater business was disrupted by TV in the 1950s.
