Foster, W. When you've made enough to make a difference: A strategy for becoming an effective philanthopist. Harvard Business Review.
Lua i Stíl Chicago (17ú heag.)Foster, William. "When You've Made Enough to Make a Difference: A Strategy for Becoming an Effective Philanthopist." Harvard Business Review .
Lua MLA (9ú heag.)Foster, William. "When You've Made Enough to Make a Difference: A Strategy for Becoming an Effective Philanthopist." Harvard Business Review, .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.