- [**Wikipedia**](https://wikipedia.com) - [**Internetowa encyklopedia PWN**](https://encyklopedia.pwn.pl/) - [**Encyklopedia ENCENC**](https://encenc.pl/)  - **[Encykopedia Britannica](https://www.britannica.com/)** - **[Stanford Encyclopedia of Philosophy](https://plato.stanford.edu/)** - **[Encyclopedia.com](https://www.encyclopedia.com/)** - **[Columbia Encyclopedia](https://www.infoplease.com/encyclopedia)** - **[Encyklopedia Smithsonian](https://www.si.edu/explore)** - **[Encyklopedia New World](https://www.newworldencyclopedia.org/entry/Encyclopedia)**