[it] Protocollo Sigma St. Martin's Paperbacks

[en] The Sigma Protocol St. Martin's Paperbacks

[nl] Het Sigma Protocol St. Martin's Paperbacks

[en] The Prometheus Deception / Sigma Protocol St. Martin's Griffin

[en] Last Wolf at Eagle Well Morgan James Fiction

[en] 1942 Ballantine Books

[fr] Le protocole Sigma Livre de Poche