ANCIENT ATOM BOMBS: FACT, FRAUD, AND THE MYTH OF PREHISTORIC NUCLEAR WARFARE BY JASON COLAVITO (2011)
UFOS AND RELATED SUBJECTS: AN ANNOTATED BIBLIOGRAPHY BY LYNN E. CATOE, LIBRARY OF CONGRESS, DEFENSE TECHNICAL INFORMATION CENTER (1969)
THE CELTIC DRUIDS, OR, AN ATTEMPT TO SHEW THAT THE DRUIDS WERE THE PRIESTS OF ORIENTAL COLONIES WHO EMIGRATED FROM INDIA… BY GODFREY HIGGINS (1827)
