Market share (English Wikipedia)

Farris, Paul W.; Neil T. Bendle; Phillip E. Pfeifer; David J. Reibstein (2010). Marketing Metrics: The Definitive Guide to Measuring Marketing Performance. Upper Saddle River, New Jersey: Pearson Education, Inc. ISBN 0137058292. The Marketing Accountability Standards Board (MASB) endorses the definitions, purposes, and constructs of classes of measures that appear in Marketing Metrics as part of its ongoing Common Language: Marketing Activities and Metrics Project Archived 2009-11-28 at the Wayback Machine.

upenn.edu (Global: 702^nd place; English: 520^th place)

J. Scott Armstrong and Kesten C. Greene (2007). "Competitor-oriented Objectives: The Myth of Market Share". International Journal of Business. 12 (1): 116–134. ISSN 1083-4346.
J. Scott Armstrong and Fred Collopy (1996). "Competitor Orientation: Effects of Objectives and Information on Managerial Decisions and Profitability" (PDF). Journal of Marketing Research. 23 (2). American Marketing Association: 188–199. doi:10.2307/3152146. JSTOR 3152146. Archived from the original (PDF) on 2010-12-17.

Farris, Paul W.; Neil T. Bendle; Phillip E. Pfeifer; David J. Reibstein (2010). Marketing Metrics: The Definitive Guide to Measuring Marketing Performance. Upper Saddle River, New Jersey: Pearson Education, Inc. ISBN 0137058292. The Marketing Accountability Standards Board (MASB) endorses the definitions, purposes, and constructs of classes of measures that appear in Marketing Metrics as part of its ongoing Common Language: Marketing Activities and Metrics Project Archived 2009-11-28 at the Wayback Machine.
J. Scott Armstrong and Fred Collopy (1996). "Competitor Orientation: Effects of Objectives and Information on Managerial Decisions and Profitability" (PDF). Journal of Marketing Research. 23 (2). American Marketing Association: 188–199. doi:10.2307/3152146. JSTOR 3152146. Archived from the original (PDF) on 2010-12-17.

J. Scott Armstrong and Kesten C. Greene (2007). "Competitor-oriented Objectives: The Myth of Market Share". International Journal of Business. 12 (1): 116–134. ISSN 1083-4346.