What's it called when a book title is mentioned in a book?

title

i.e if a book is called my only lover and a character says my only lover
or is there no word for it??

I'd just call it a titular or eponymous phrase. I've never really encountered a proper literary term for it.

I'd just call it a titular or eponymous phrase. I've never really encountered a proper literary term for it.

thanks

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