Harrison, I. (2004). The book of inventions: How'd they come up with that. National Geographic.
Citace podle Chicago (17th ed.)Harrison, Ian. The Book of Inventions: How'd They Come Up with That. Washington, D.C: National Geographic, 2004.
Citace podle MLA (9th ed.)Harrison, Ian. The Book of Inventions: How'd They Come Up with That. National Geographic, 2004.
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