Newman, Andy. "New Area Codes Introduced", New Jersey Daily Briefing, The New York Times, June 2, 1997. Accessed January 23, 2008. https://www.nytimes.com/1997/06/02/nyregion/new-area-codes-introduced.html
"About Verizon New Jersey: Years 1985 to 1998" Archived November 13, 2007, at the Wayback Machine, Verizon Communications, accessed May 12, 2007. http://www.verizonnj.com/about/community/nj/about/history/1985_1998.asp
The Record (Bergen County), April 18, 2001. Accessed August 11, 2001. "The new New Jersey area codes—551, 356, and 848—were announced this week and will be introduced next year in the regions currently served by 201, 973, and 732, respectively." /wiki/The_Record_(Bergen_County)