Knauer, K. (2009). Time great discoveries: Explorations that changed history. Time Inc. Home Entertainment.
Citace podle Chicago (17th ed.)Knauer, Kelly. Time Great Discoveries: Explorations That Changed History. New York, NY: Time Inc. Home Entertainment, 2009.
Citace podle MLA (9th ed.)Knauer, Kelly. Time Great Discoveries: Explorations That Changed History. Time Inc. Home Entertainment, 2009.
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