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Now I connect library SafeMath.sol in local project.

pragma solidity ^0.4.15;
   import './ERC20.sol';
   import './SafeMath.sol';

How can I connect SafeMath.sol from external(non-local) resources or other contracts?

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When using import statements you need to have the actual files of the imported contracts as well. In your case, ./SafeMath.sol specifies to the compiler that the contract you are importing is in the same directory with your own contract.

Please see more regarding import paths in : How should we set a import path in solidity?

And in case you want to link your contract to a library: What are the steps to compile and deploy a library in Solidity?

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