PORTER, M. E. (1980). Competitive strategy: Techniques for analyzing industries and competitors. The Free Press.
芝加哥风格引文PORTER, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York: The Free Press, 1980.
MLA引文PORTER, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. The Free Press, 1980.
警告：这些引文格式不一定是100％准确.