Ebrahim, Alnoor, and V. Kasturi Rangan. "What Impact? A Framework for Measuring the Scale & Scope of Social Performance." California Management Review 56, no. 3 (Spring 2014): 118–141.
Ebrahim, Alnoor, and V. Kasturi Rangan. "The Limits of Nonprofit Impact: A Contingency Framework for Measuring Social Performance." Harvard Business School Working Paper, No. 10-099, May 2010.