Wikibooks:Reading room - Wikibooks, open books for an open world. en.wikibooks.org [online]. [cit. 2023-04-16]. Dostupné online. (anglicky)
Wikibooks:Reading room: Difference between revisions - Wikibooks, open books for an open world. en.wikibooks.org [online]. [cit. 2023-04-16]. Dostupné online. (anglicky)
Wikiversity - Wikibooks, open books for an open world. en.wikibooks.org [online]. [cit. 2023-04-16]. Dostupné online. (anglicky)
Wikiversity: Difference between revisions - Wikibooks, open books for an open world. en.wikibooks.org [online]. [cit. 2023-04-16]. Dostupné online. (anglicky)