Source et copyright
Source: East meets West: US President Gerald Ford and USSR General Secretary Leonid Brezhnev. Gerald R. Ford Library. Helsinki: Organization for Security and Co-operation in Europe, 1975. Black and White.
Organization for Security and Co-operation in Europe, OSCE. [ON-LINE]. [s.l.]: [s.d.]. Disponible sur http://www.osce.org/index.php.
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