გამოყენებული მასალა:
https://en.wikipedia.org/wiki/Heat_de...
https://en.wikipedia.org/wiki/Lake_Toba
https://en.wikipedia.org/wiki/Black_D...
https://en.wikipedia.org/wiki/Human_e...
https://en.wikipedia.org/wiki/Heat_de...
https://en.wikipedia.org/wiki/Lake_Toba
https://en.wikipedia.org/wiki/Black_D...
https://en.wikipedia.org/wiki/Human_e...