Webster, David; Murtha, Timothy; Straight, Kirk D.; Silverstein, Jay; Martinez, Horacio; Terry, Richard E.; Burnett, Richard (2007). «The Great Tikal Earthwork Revisited». Journal of Field Archaeology (1): 41–64. ISSN0093-4690. Consultado em 9 de agosto de 2022
Webster, David; Murtha, Timothy; Straight, Kirk D.; Silverstein, Jay; Martinez, Horacio; Terry, Richard E.; Burnett, Richard (2007). «The Great Tikal Earthwork Revisited». Journal of Field Archaeology (1): 41–64. ISSN0093-4690. Consultado em 9 de agosto de 2022