Antzeko izenburuak: Black Book - Telecommunications Industry (September 1976)
- Black Book - Telecommunications Industry (September 1977)
- Black Book - Broadcasting Industry (September 1973)
- Black Book - Savings & Loan Industry (September 1976)
- Black Book - Telephone Industry (May 1976)
- Black Book - Telephone Industry (October 1976)
- Black Book - Telecommunications Industry (January 1977)