Porter Michael E. (1980). Competitve Strategy: Techniques for Analyzing Industries and Competitors. Free Press.
Chicago-čujuhus (17. p.)Porter Michael E. Competitve Strategy: Techniques for Analyzing Industries and Competitors. New York: Free Press, 1980.
MLA-čujuhus (9. p.)Porter Michael E. Competitve Strategy: Techniques for Analyzing Industries and Competitors. Free Press, 1980.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.