Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "Whoever recites Surah al-A'raf, or Surah al-Najm, or 'When the sky is split open', or Surah Bani Isra'il, or 'Read in the name of your Lord who created', and wishes to bow at the end of them, let him bow; the prostration of the bowing will suffice for him. And if he prostrates, let him add another surah after it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8700