Good book for an introduction to proof based math

[mathsciguy]

I'm kind of new to proof based mathematics, can you guys give me an advice on what a good book pertaining to this should I get?

I don't really care about what particular subject in mathematics it is, just as long as it can give me a good knowledge and skills in proving, and it's something suited for a beginner.

 

[mathsciguy]

I found one, it's: Introduction to Mathematical Reasoning by Peter Eccles. Sorry, I think the thread can be closed now; or not, if you guys think you can still dump more useful books here.