STRØMGAARD, P. Daniel B. Botkin and Edward A. Keller: Environmental studies: Earth as a living planet. 2. ed. Geografisk Tidsskrift, [S. l.], v. 88, 1988. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/44540. Acesso em: 6 maj. 2024.