Trigg,Roger. (1988). Ideas of human nature: An historical introduction. Blackwell Publishers.
Lua i Stíl Chicago (17ú heag.)Trigg,Roger. Ideas of Human Nature: An Historical Introduction. Oxford: Blackwell Publishers, 1988.
Lua MLA (9ú heag.)Trigg,Roger. Ideas of Human Nature: An Historical Introduction. Blackwell Publishers, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.