Weaning and stop breastfeeding

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I am a mother of 3. I am supporting the campaign for breastfeeding. Of my 3 children, I have nursed my youngest son the longest. He is now 1 year and 3 months old. I am staying home and stopped working for him. My problem is, I wanted to stop nursing him because it's already painful and he always bite my nipple. I don't know how to stop him coz we are always together at home and everytime he feels like, he would just look for my nipples under my shirt. The rest of my children just stopped nursing themselves, without any effort from me. Anybody who can tip me any strategy?