Epstein, M. J., & Yuthas, K. (2014). Measuring and improving social impacts: A guide for nonprofits, companies, and impact investors (First edition.). Berrett-Koehler Publishers.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Epstein, Marc J., و Kristi Yuthas. Measuring and Improving Social Impacts: A Guide for Nonprofits, Companies, and Impact Investors. First edition. San Francisco: Berrett-Koehler Publishers, 2014.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Epstein, Marc J., و Kristi Yuthas. Measuring and Improving Social Impacts: A Guide for Nonprofits, Companies, and Impact Investors. First edition. Berrett-Koehler Publishers, 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.