APA Style
      BIKNER-AHSBAHS, A. et al (2016).
    Approaches to Qualitative Research in Mathematics Education: Examples of Methodology and Methods (Ed. 1).
    Dordrecht:
  Springer Dordrecht.
  
MLA Style
      BIKNER-AHSBAHS, Angelika. et al.
    "Approaches to Qualitative Research in Mathematics Education: Examples of Methodology and Methods".
    Ed. 1
    Dordrecht:
  Springer Dordrecht,
  2016.
  Text.