APA Style
      KONIETZKA, D., KREYENFELD, M. (2017).
    Childlessness in Europe: Contexts, Causes, and Consequences .
    Cham:
  Springer Cham.
  
MLA Style
      KONIETZKA, Dirk., KREYENFELD, Michaela.
    "Childlessness in Europe: Contexts, Causes, and Consequences".
    
    Cham:
  Springer Cham,
  2017.
  Text.