Far-fetched Mathematics on Mars - Pepijn van Erp
What is Cydonia? - Universe Today
face on Mars - The Skeptic's Dictionary
Cydonia (Region of Mars)
Mars nuclear explosion photograph debunked
ESA - Cydonia - the face on Mars
Roaming Astronomer: Happy 36th, Face on Mars!
Image of MARS GLOBAL SURVEYOR IMAGE OF THE FACE ON MARS, 1998-04-06
The Cydonia D&M Pyramid Landform
ESA - Cydonia - the face on Mars
Cydonia: Martian Mystery Region