Boff, L. (2008). Essential care: An ethics of human nature. Baylor University Press.
Chicago-čujuhus (17. p.)Boff, Leonardo. Essential Care: An Ethics of Human Nature. Waco, TX: Baylor University Press, 2008.
MLA-čujuhus (9. p.)Boff, Leonardo. Essential Care: An Ethics of Human Nature. Baylor University Press, 2008.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.