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For a longer term read I'd recommend Hill & Myatt, the Economics Anti Textbook. It's a fair introduction to Economics 101 but at the same time provides more in depth critique than an introductory book usually would, of where Economics 101 fails, and how it tends to get over-applied in policy.

Ha Joon Chang, Economics: the Users Guide and 23 Things They Don't Tell You About Capitalism (don't dismiss it as an anti-capitalist treatise, it's not) are also good, lighter weight (unlike Hill & Myatt no maths) but give an overview of the different schools of economics and what can be drawn from each.