Citação norma APA

Welzer, H. (2008). On killing and morality: How normal people become mass murderers. Ordinary people as mass murderers.

Citação norma Chicago

Welzer, Harald. "On Killing and Morality: How Normal People Become Mass Murderers." Ordinary People as Mass Murderers 2008.

Citação norma MLA

Welzer, Harald. "On Killing and Morality: How Normal People Become Mass Murderers." Ordinary People as Mass Murderers, 2008.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.