a textbook case of (something)

A clear and characteristic instance or example of something. Your honor, this is a textbook case of a conflict of interest. Every aspect of the deal points to that conclusion! All of the symptoms you've described present a textbook case of dissociative identity disorder. This is a textbook case of manipulation, and I refuse to be a part of it!

textbook example (of something)

A clear and characteristic instance, example, or demonstration of something. This entire project was a textbook example of mismanagement, from its troubled beginnings to its bungled execution. All of the symptoms you've described present a textbook example of dissociative identity disorder.