Tham khảo Player versus player

  1. ↑ Bartle, Richard (2003). Designing Virtual Worlds. New Riders. tr. 407. ISBN 0-13-101816-7. Player(s) Versus Player(s) (PvP). Players are opposed by other players in a game. In a combat situation, this means PCs can fight each other. 
  2. ↑ Bartle, Richard (2003). Designing Virtual Worlds. New Riders. tr. 407. ISBN 0-13-101816-7. PvP and GvG both assume PvE. 
  3. ↑ Sicart, Michael (2011). The Ethics of Computer Games. MIT Press. tr. 179–184. ISBN 9780262261531.