1) Check out [this function.][1]
2) Search [old questions.][2]
3) Look in MouseLook script in Standard Assets, it has this implemented
[1]: http://docs.unity3d.com/ScriptReference/Mathf.Clamp.html
[2]: https://www.google.si/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=unity+limit+rotation+
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