1. National Consumers League: Telemarketing scams, January–December 2004.
http://www.fraud.org/telemarketing/2004-telemarketing%20scams.pdf
. Accessed 19 Feb 2018
2. National Consumers League. Scammers targeting their victims by age group, says National Consumers League’s Fraud Center (2012).
https://www.nclnet.org/scammers_targeting_their_victims_by_age_group_says_national_consumers_league_rsquo_s_fraud_center
. Accessed 27 May 2020
3. Johnson, K.D.: Financial crimes against the elderly. US Department of Justice, Office of Community Oriented Policing Services (2004).
http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=3F220FD69925296F7AFBF59560199A6B?doi=10.1.1.531.309&rep=rep1&type=pdf
. Accessed 27 May 2020
4. Kok, K.F.: Truecaller insights special report: An estimated 22.1M Americans lost $9.5B in phone scams last year. Truecaller (2017).
https://truecaller.blog/2017/04/19/truecaller-us-spam-report-2017/
. Accessed 27 May 2020
5. Alves, L.M., Steve, R.W.: The effects of loneliness on telemarketing fraud vulnerability among older adults. J. Elder Abuse Neglect 20(1), 63–85 (2008)