EGGERS, Hellmut. On Yesbuts and Whynots. Journal of MultiDisciplinary Evaluation, Kalamazoo, MI, USA, v. 4, n. 7, p. 107, 2007. DOI: 10.56645/jmde.v4i7.21. Disponível em: https://jmde.journals.publicknowledgeproject.org/index.php/jmde_1/article/view/21. Acesso em: 4 may. 2026.