Porter's four corners model (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Porter's four corners model" in English language version.

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1web.archive.org

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exinfm.com

Matt H. Evans, CPA, CMA, CFM, Course 12: Competitive Intelligence (Part 2 of 2) (PDF), Excellence in Financial Management{{citation}}: CS1 maint: multiple names: authors list (link)

web.archive.org

Competitive Analysis Training, Society of Competitive Intelligence Professionals (SCIP)