APA Style
      BOROVIK,Alexandre, ., GARDINER, T. (2019).
    The Essence of Mathematics Through Elementary Problems .
    :
  Open Book Publishers.
  
MLA Style
      BOROVIK,Alexandre, ., GARDINER, Tony.
    "The Essence of Mathematics Through Elementary Problems".
    
    :
  Open Book Publishers,
  2019.
  Text.