Juristic Concept of the Validity of Statutory Law
  MLA
  Grabowski, Andrzej, and Malgorzata Kieltyka. Juristic Concept of the Validity of Statutory Law. Springer Berlin Heidelberg, 2013.
  APA
  Grabowski, A., & Kieltyka, M. (2013). Juristic Concept of the Validity of Statutory Law. Springer Berlin Heidelberg.
  Chicago
  Grabowski, Andrzej, and Malgorzata Kieltyka. Juristic Concept of the Validity of Statutory Law. : Springer Berlin Heidelberg, 2013.