Killing, P. M. Must-win Battles. Pearson Education UK.
Dyfyniad Arddull ChicagoKilling, Peter; Malnight. Must-win Battles. Pearson Education UK.
Dyfyniad MLAKilling, Peter; Malnight. Must-win Battles. Pearson Education UK.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.