APA Style
      Davis, M. et al (2015).
    Logic for Programming, Artificial Intelligence, and Reasoning: 20th International Conference, LPAR-20 2015, Suva, Fiji, November 24-28, 2015, Proceedings .
    Heidelberg:
  Springer Berlin, Heidelberg.
  
MLA Style
      Davis, Martin. et al.
    "Logic for Programming, Artificial Intelligence, and Reasoning: 20th International Conference, LPAR-20 2015, Suva, Fiji, November 24-28, 2015, Proceedings".
    
    Heidelberg:
  Springer Berlin, Heidelberg,
  2015.
  Text.