How do I cite IPUMS-CPS data?
Miriam King, Steven Ruggles, J. Trent Alexander, Sarah Flood, Katie Genadek, Matthew B. Schroeder, Brandon Trampe, and Rebecca Vick. Integrated Public Use Microdata Series, Current Population Survey: Version 3.0. [Machine-readable database]. Minneapolis, MN: Minnesota Population Center [producer and distributor], 2010.
SuperSearch is a great place to start searching for supporting literature in the form of journal articles, books and almost everything else the library has, in one easy to use interface.
Changes in U.S. federal or state laws can be tricky to find and may be in print sources. Try these sites:
If you are dealing with non-U.S. data, you may want to relate your data to changes in the laws of your country/countries around a particular issue over time. Such information can be trickier to find than those for the U.S. Try these places first: