TREDGOLD, J. H. Analysis of the calcareous tuffa at Green Point. South African Quarterly Journal, Cape Colony, v. 1, n. 4, p. 445, 1829. DOI: 10.21504/saqj.14.2673. Disponível em: https://journal.ru.ac.za/index.php/saqj/article/view/2673. Acesso em: 20 nov. 2025.