1 https://scholarled.org/ .
2 http://oapen.org/home .
3 https://books.openedition.org/?lang=en .
4 http://radicaloa.disruptivemedia.org.uk/ .
5 https://publicationethics.org/ .
6 https://www.doabooks.org/ .
7 Figures obtained via correspondence with the three presses.