Coba jelasin Bibliografi dari Michael H. Hart dong

The 100: A Ranking of the Most Influential Persons in History, 1978 (Revised Edition, 1992)

Extra-Terrestrials, Where Are They? (co-edited with Ben Zuckerman), 1982

A View from the Year 3000 (Poseidon Press, 1999)

Understanding Human History (Washington Summit Publishers, 2007).