Gonçalves, R. C. “The Meta-Ethical Distinction Between Duty and Desire, and the Normativity of Moral Acts”. Prim@ Facie - Law, History and Politics, vol. 10, no. 19, Sept. 2012, pp. 165-7, https://periodicos.ufpb.br/ojs/index.php/primafacie/article/view/8489.