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Du Prel J-B, Hommel G, Röhrig B, Blettner M. Confidence interval or P-value?: part 4 of a series on evaluation of scientific publications. Dtsch Arztebl Int. 2009;106(19):335-339.
Article available online: Hatala R, Keitz S, Wyer P, Guyatt G. Tips for learners of evidence-based medicine: 4. assessing heterogeneity of primary studies in systematic reviews and whether to combine their results. CMAJ. 2005;172(5):661-665.