IKERD, John. Letter to the Editorial Office: A Revolution of the Middle… and the Pursuit of Happiness: Information About the Book. Problemy Ekorozwoju, [S. l.], v. 5, n. 2, p. 156–157, 2010. Disponível em: https://ph.pollub.pl/index.php/preko/article/view/4759. Acesso em: 22 jul. 2024.