Answered by Shaykh Abu Usamah
Holding a book and reciting from it will invalidate the prayer, be it Fard, Wajib, Sunna or Nafl. This is due to its constituting Amal Kathir (a great amount of action that renders the prayer invalid) and more so because it entails being prompted from a book.
You should simply recite those suras that you do know and continue with your efforts to learn more suras and include them in your salah.
(Radd al-Muhtar 1.672, Dar al-Fikr)
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