Foot, P. (2001). Natural goodness. Clarendon ; Oxford University Press.
Chicago-čujuhus (17. p.)Foot, Philippa. Natural Goodness. Oxford : New York: Clarendon ; Oxford University Press, 2001.
MLA-čujuhus (9. p.)Foot, Philippa. Natural Goodness. Clarendon ; Oxford University Press, 2001.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.