"Appropriate attribution" means giving credit to the person or source who created or provided the information, idea, or work you are using or referring to. Full definition
While some copied materials written by leaders in the field are suggested, you should provide appropriate attribution. (apfmnet.org)
They can also create derivative works, but you still must be given appropriate attribution. (rocketlawyer.com)
Digital rights management and ensuring appropriate attribution to sources - Dennis Villano and Andy Marcinek (Burlington Public Schools Instructional Technology Dept.) (edutopia.org)