Coba jelasin Lihat pula dari Spam dong

Goodman, Danny. Spam Wars - Our Last Best Chance to Defeat Spammers, Scammers, and Hackers. New York: SelectBooks, Inc, 2004.

Sjouwerman, Stu; Posluns, Jeffrey, "Inside the spam cartel: trade secrets from the dark side". UVD Elsevier/Syngress; 1st edition, 2004.