APA Style
      Olko, J., Sallabank, J. (2021).
    Revitalizing Endangered Languages: A Practical Guide .
    Cambridge:
  Cambridge University Press.
  
MLA Style
      Olko, Justyna., Sallabank, Julia.
    "Revitalizing Endangered Languages: A Practical Guide".
    
    Cambridge:
  Cambridge University Press,
  2021.
  Text.