Bernardes de Moraes, Thiago Perez, und Felipe dos Santos Millani. „Altruism and evolutionary pahway. A review on the evolution of altruistic behaviour“. Nómadas. Critical Journal of Social and Juridical Sciences, Bd. 42, Nr. 2, April 2015, S. 5-19, https://doi.org/10.5209/rev_NOMA.2014.v42.n2.48782.