To get the quality back links, first your site must contain quality content, and commenting on Do follow blogs, getting in bound links and due to article submission you can get permanent back links to your site as getting traffic also helps you in getting back link juice.
Blog Post and Commenting---say something for teh content's sake
Forums Posting---contributing useful info
Article Submission---no duplicating and relible article website
Directory Submission---free one usually don't give u much help ,go for the paid one
Social Bookmarking--make u stuff unique enough for others to bookmark u
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