Nicol, S. J., D. A. Harris, M. R. Kebbell, and J. Ogilvie. “Online Child Sexual Exploitation Material: A Comparison From Police Data on Men Charged With Child Sexual Exploitation Material Exclusively and Men Charged With Contact Child Sexual Abuse Exclusively”. Sexual Offending: Theory, Research, and Prevention, Vol. 16, Dec. 2021, pp. 1-18, doi:10.5964/sotrap.4301.