Wiggins, D. (1998). Needs, values, truth: Essays in the philosophy of value (3rd ed.). Clarendon Press.
Lua i Stíl Chicago (17ú heag.)Wiggins, David. Needs, Values, Truth: Essays in the Philosophy of Value. 3rd ed. Oxford, England: Clarendon Press, 1998.
Lua MLA (9ú heag.)Wiggins, David. Needs, Values, Truth: Essays in the Philosophy of Value. 3rd ed. Clarendon Press, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.