Calleman, Dr. Carl Johan, The Mayan Calendar and the Transformation of Consciousness, Bear & Company, 2004
Calleman, Dr. Carl Johan, Solving the Greatest Mystery of Our Time: The Mayan Calendar, GAREV Publishing International, 2001
Clow, Barbara Hand, The Mayan Code: Time Acceleration and Awakening the World Mind, Bear & Company, 2007 Mayan Calendar and Conversion Codex,Majix Inc.,1999, available: www.mayanmajix.com
