Pekka Santtila; Tom Pakkanen; Angelo Zappalà; Dario Bosco; Maria Valkama; Andreas Mokros (2008). "Behavioural crime linking in serial homicide". Psychology, Crime & Law. 14 (3). Taylor Francis: 245–265. doi:10.1080/10683160701739679. S2CID143323758.
Pekka Santtila; Tom Pakkanen; Angelo Zappalà; Dario Bosco; Maria Valkama; Andreas Mokros (2008). "Behavioural crime linking in serial homicide". Psychology, Crime & Law. 14 (3). Taylor Francis: 245–265. doi:10.1080/10683160701739679. S2CID143323758.