by Dolores Cannon, Ozark Mountain Publishing
by Len Kasten
by John A. Keel
by Mack
by Elkins Rueckert & McCarty, James Allen McCarty, Carla Rueckert
by Jacques Vallee
by Charles F. Stanley
by Thomas J. Carey, Donald R. Schmitt, Edgar Mitchell, George Noory
by Zecharia Sitchin