FRISCHEN, A.; MANSHARD, W. Kulturräumliche Strukturwandlungen am Volta River. ERDKUNDE, [S. l.], v. 25, n. 1, p. 51–65, 1971. DOI: 10.3112/erdkunde.1971.01.05. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1631. Acesso em: 11 dec. 2024.