HORUS EDITIONS. (2002). THE ULTIMATE HOW IT WORKS ENCYCLOPEDIA. HORUS EDITIONS.
Chicago-čujuhus (17. p.)HORUS EDITIONS. THE ULTIMATE HOW IT WORKS ENCYCLOPEDIA. HORUS EDITIONS, 2002.
MLA-čujuhus (9. p.)HORUS EDITIONS. THE ULTIMATE HOW IT WORKS ENCYCLOPEDIA. HORUS EDITIONS, 2002.
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