http://www.wiadomosci24.pl/artykul/torun_zamach_na_wyrost_czy_prezydent_w_sam_raz_na_zamach_330795.html Autor: Nicolò Paternoster Mat. ilustr. http://www.jonathoncolman.org/2013/01/07/a-guide-to-public-speaking-for-introverted-and-shy-people/ Licencja: CC4.0
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