Coba jelasin Lihat pula dari Chicago Board of Trade dong

Durica, Dr. Michael (2006). Product Development for Electronic Derivative Exchanges: The case of the German ifo business climate index as underlying for exchange traded derivatives to hedge business cycle risk. Pro Business. Berlin. ISBN 10: 3-939533-05-X.

Ryan, Oliver (Nov. 14, 2005). "Chicago's Making A Contracts Killing". Fortune, p. 22.