APA Style
      KAHL, W. et al (2015).
    Relational and Algebraic Methods in Computer Science .
    Cham, Switzerland:
  Springer Cham.
  
MLA Style
      KAHL, Wolfram. et al.
    "Relational and Algebraic Methods in Computer Science".
    
    Cham, Switzerland:
  Springer Cham,
  2015.
  Text.