Garramone, Gina M.; Atkin, Charles K.; Pinkleton, Bruce E.; Cole, Richard T. (1990). "Effects of negative political advertising on the political process". Journal of Broadcasting & Electronic Media. 34 (3). Informa UK Limited: 299–311. doi:10.1080/08838159009386744. ISSN0883-8151.
Garramone, Gina M.; Atkin, Charles K.; Pinkleton, Bruce E.; Cole, Richard T. (1990). "Effects of negative political advertising on the political process". Journal of Broadcasting & Electronic Media. 34 (3). Informa UK Limited: 299–311. doi:10.1080/08838159009386744. ISSN0883-8151.