- Getty & Fromkess Corporation
- (A J. Ronald Getty and Leon Fromkess Film)
- Warner Brothers Pictures
- (United Kingdom, 1971)(theatrical)
- Warner Bros.
- (United States, 1971)(Warner Bros. Pictures A Time Warner Entertainment Company, theatrical)
- Warner-Sergel Film
- (Sweden, 1971)(theatrical)
- Warner Bros. Pictures
- (Argentina, 1971)(theatrical)
- National Broadcasting Company (NBC)
- (United States, 1974)(TV)
- Malta Film Facilities
- (Malta Film Facilities Ltd., Malta, made at)
- The British Forces in Malta
- (The British Forces in Malta, the producers wish to thank)
- The Ministry of Public Buildings & Works
- (The Ministry of Public Buildings & Works {on behalf of the Secretary of State for Wales}, the producers wish to thank for Carreg Cennan Castle, Wales)
- The National Liberal Club, London
- (The National Liberal Club, London, the producers wish to thank)
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