Epic Wither Boss Battle - Minecraft 12w34a - YouTube
Wither - Minecraft Wiki Guide - IGN
MINECRAFT WITHER BOSS BATTLE! Wither VS Rainbow Wither in Minecraft - YouTube
The Wither Boss In Minecraft Pocket Edition! - MCPE Gameplay - Boss Fight - Concept Video - YouTube
Tutorials/Defeating the wither – Minecraft Wiki
Minecraft- Wither Boss Battle: Survival - YouTube
Finally ... I managed to kill the wither boss who ruined my world. And the best thing is that I only needed 17 totems, full diamond armor and a few potions. :
Wither – Minecraft Wiki
How to Find the Wither in Minecraft - Minecraft Station