Gerressu, Makeda Mercer, Catherine H. Graham, Cynthia A. Wellings, Kaye Johnson, Anne M. (27 February 2007). "Prevalence of Masturbation and Associated Factors in a British National Probability Survey". In Ollendick, Thomas H. Schroeder, Carolyn S. (eds.). Bockting, Walter O. Coleman, Eli (eds.). Heiby, Elaine Becker, James D. (April 1980). "Effect of filmed modeling on the self-claimed frequency of masturbation". Hibberd, James (June 3, 2015).