References to verse 3:21

BookReference
Islam and Freedom of Conscience 2 And say to those who have been given the Book and to the unlearned, “Have you submitted?” If they submit, then they will surely be guided; but if they turn back, then thy duty is only to convey the message. (Surah Al‐e‐‘Imran, 3:21)
The Blessed Model of the Holy Prophet Muhammad and the Caricatures 1 And say to those who have been given the Book and to the unlearned, ‘Have you submitted?’ If they submit, then they will surely be guided; but if they turn back, then thy duty is only to convey the message. (Surah Al-e-Imran, 3:21)
The Life & Character of the Seal of Prophets - Volume II 7 Āl-e-‘Imrān (3:21)