Delete Book

I created the listal page for a book that a friend wrote (www.listal.com/book/lo-definitivo-y-lo-temporal-javier-a-moreno). Later I found it was on amazon www.listal.com/book/lo-definitivo-y-lo-temporal (sorry). How can I delete the first one I made? Thanks

Sorry I deleted the wrong one by mistake, i thought it was best just to delete the other one so you can add again.

ty! ;)