Hello Einar O.
The Community Tool Box likes it when people use our material and reference us. There is no problem with citing the web platform when you reference material in an academic presentation. The rights reservation and copyrighting are so that people can't take the material and pretend it is their own. Sharing the learning and citing it appropriately is not only OK, but it helps us to get the work out. So, thank you for using and citing the material, and thank you for asking.
The Community Tool Box Advisor
