All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
Indeed you have done a great work as you have saved a person from Hellfire. Calling a person to Islam and teaching Islam are the most encouraged acts in Islam. For details, please read to Fatwa: 84844.
As for books, we suggest that you and this man visit the following centres, and you will find scholars there in various languages who spread Islam. You will even find literature, cassettes and other required material in various languages free of cost.
1) Fanar, Souqh Faleh Phone: 4250280.
2) Qatar Guest centre, Phone: 4862390.
3) Ministry of Awqaf in As-Sadd: 4470777.
May Allaah bless you and make you, and us steadfast.
Allaah Knows best.