Jett, Stephen C. “Pre-Columbian Transoceanic Contacts: Far-Out Fantasy, Unproven Possibility, or Undeniable Reality?”. Journal of Scientific Exploration 28, no. 1 (May 14, 2014). Accessed May 7, 2024. https://journalofscientificexploration.org/index.php/jse/article/view/677.