@book{OPUS4-10299,
  title     = {Foundation of Digital Badges and Micro-Credentials},
  series    = {Demonstrating and Recognizing Knowledge and Competencies},
  editor    = {Dirk Ifenthaler and Nicole Bellin-Mularski and Dana-Kristin Mah},
  isbn      = {978-3-319-15424-4},
  year      = {2016},
}