APA Style
      Vohns, A. et al (2016).
    Theories in and of Mathematics Education
Theory Strands in German Speaking Countries .
    The Editor:
  Springer Cham.
  
MLA Style
      Vohns, Andreas. et al.
    "Theories in and of Mathematics Education
Theory Strands in German Speaking Countries".
    
    The Editor:
  Springer Cham,
  2016.
  Text.