Pierre Danel and Paul Anglès d'Auriac (1963) Improvements in or relating to artificial blocks for building structures exposed to the action of moving water [1]
japantimes.co.jp
Hesse, Stephen (2007-07-22). "TETRAPODS". The Japan Times Online (dalam bahasa Inggris). ISSN0447-5763. Diakses tanggal 2017-08-02.