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