↑ Erik Vance, “Unprecedented Mayan Mural Found, Contradicts 2012 ‘Doomsday’ Myth”, National Geographic, May 10, 2012; WEB
↑ Vance, Eric (१० मे २०१२), "Unprecedented Maya Mural Found, Contradicts 2012 "Doomsday" Myth", National Geographic, अन्तिम पहुँच ११ मे २०१२।