Szukana fraza: [Bibliografia = %2219. Kunzig R.%2C 2011. 7 billion%2C National Geographic%2C Special Series%2C January 2011%2C http%5C:%5C%2F%5C%2Fngm.nationalgeographic.com%5C%2F2011%5C%2F01%5C%2Fseven%5C-billion%5C%2Fkunzig%5C-text %5C%5B6 November 2015%5C%5D.%22]

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