O´REILLY STERNBERG, H. Development and Conversation. ERDKUNDE, [S. l.], v. 27, n. 4, p. 253–265, 1973. DOI: 10.3112/erdkunde.1973.04.02. Disponível em: https://www.erdkunde.uni-bonn.de/article/view/1700. Acesso em: 30 apr. 2025.