Where is this situation in rule or case book??

[Nevadaref]

I do not believe that this play is covered specifically or separately in the books. It is simply covered by the general backcourt rule. If none of the exceptions apply (because they only apply to the airborne player himself), it is a backcourt violation.
I'm sure that makes sense to you, and you also know that you are right because the answer key to the test this year tells you so.