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no DOI — not checkedKey Industry Data. Top Brands Shipments and Share: 2010–2012
no DOI — not checkedBrown University Longitudinal Data Base. 2010. Data. Providence, RI. Accessed July 14, 2014. http://www.s4.brown.edu/us2010/Researcher/Bridging.htm.
no DOI — not checkedbibr9-1091142115591204
no DOI — not checkedNichols Austin. 2011. rd 2.0: Revised Stata Module for Regression Discontinuity Estimation. Accessed February 25, 2014. http://ideas.repec.org/c/boc/bocode/s456888.html.
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