READER'S DIGEST ASSO. (1952). INVENTIONS THAT CHANGED THE WORLD. READERS DIGEST.
Chicago-referens (17:e uppl.)READER'S DIGEST ASSO. INVENTIONS THAT CHANGED THE WORLD. LONDON: READERS DIGEST, 1952.
MLA-referens (9:e uppl.)READER'S DIGEST ASSO. INVENTIONS THAT CHANGED THE WORLD. READERS DIGEST, 1952.
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