Gallenkamp, C. (1981). Maya, the riddle and rediscovery of a lost civilization (2d rev. ed.). Penguin Books.
Lua i Stíl Chicago (17ú heag.)Gallenkamp, Charles. Maya, the Riddle and Rediscovery of a Lost Civilization. 2d rev. ed. Harmondsworth, Middlesex, Eng., New York: Penguin Books, 1981.
Lua MLA (9ú heag.)Gallenkamp, Charles. Maya, the Riddle and Rediscovery of a Lost Civilization. 2d rev. ed. Penguin Books, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.