- Chirped Echo from the Mayan Pyramid of Kukulkan at Chichen Itza - David Lubman of the Acoustical Society of America argues that the echo sounds like the primary call of the Mayan sacred bird, the Quetzal.
- Moving Beyond Prophecies & Predictions - By Cynthia Gage (Atlantisrising)
- Rock Art Acoustics - Steven. J. Waller's Home Page
- Stone Structures and Sound -
