Guinness World Records Limited. (2010). Guinness world records 2011. Guinness World Records.
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Dyfyniad Arddull Chicago
Guinness World Records Limited. Guinness World Records 2011. London: Guinness World Records, 2010.
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Dyfyniad MLA
Guinness World Records Limited. Guinness World Records 2011. Guinness World Records, 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.