Gem citationer
APA (7th ed.) Citation
Johns, C. (2014). National geographic: The truth about black holes. National Geographic.
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Chicago Style (17th ed.) Citation
Johns, Chris. National Geographic: The Truth About Black Holes. Washington: National Geographic, 2014.
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MLA (9th ed.) Citation
Johns, Chris. National Geographic: The Truth About Black Holes. National Geographic, 2014.
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