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"NSFNet Acceptable Use Policy". Information Policies: A Compilation of Position Statements, Principles, Statutes, and Other Pertinent Statements. Coalition for Networked Information. Diarsipkan dari versi asli tanggal 24 August 2013. Diakses tanggal 24 June 2013.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Junk Mail". Electronic Billboards on the Digital Superhighway: A Report of the Working Group on Internet Advertising. The Coalition for Networked Information. 28 September 1994. Diarsipkan dari versi asli tanggal 15 June 2013. Diakses tanggal 24 June 2013.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Jansen, B.J.; Mullen, T. (2008). "Sponsored search: an overview of the concept, history, and technology". International Journal of Electronic Business. 6 (2): 114–131. doi:10.1504/ijeb.2008.018068.
Moe, Wendy W. (2013). "Chapter 9: Targeting Display Advertising"(PDF). Advanced Database Marketing: Innovative Methodologies & Applications for Managing Customer Relationships. Gower Publishing, London. ISBN978-1409444619. Diarsipkan dari versi asli(PDF) tanggal 23 August 2012. Diakses tanggal 20 June 2013.
uncp.edu
Curtis, Dr. Anthony (2013). "The Brief History of Social Media". Mass Communication Department, University of North Carolina at Pembroke. Diarsipkan dari versi asli tanggal 16 March 2012. Diakses tanggal 9 June 2013.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
web.archive.org
Nakamura, Leonard I. (FRB); Samuels, Jon (BEA); Soloveichik, Rachel H. (BEA) (October 24, 2017). "Measuring the "Free" Digital Economy Within the GDP and Productivity Accounts"(PDF). SSRN.com. Social Science Research Network publishing working paper 17-37 of the Research Department, Federal Reserve Bank of Philadelphia. hlm. 37 (Fig. 3). Diarsipkan dari versi asli(PDF) tanggal March 20, 2021.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"NSFNet Acceptable Use Policy". Information Policies: A Compilation of Position Statements, Principles, Statutes, and Other Pertinent Statements. Coalition for Networked Information. Diarsipkan dari versi asli tanggal 24 August 2013. Diakses tanggal 24 June 2013.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Junk Mail". Electronic Billboards on the Digital Superhighway: A Report of the Working Group on Internet Advertising. The Coalition for Networked Information. 28 September 1994. Diarsipkan dari versi asli tanggal 15 June 2013. Diakses tanggal 24 June 2013.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Curtis, Dr. Anthony (2013). "The Brief History of Social Media". Mass Communication Department, University of North Carolina at Pembroke. Diarsipkan dari versi asli tanggal 16 March 2012. Diakses tanggal 9 June 2013.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Moe, Wendy W. (2013). "Chapter 9: Targeting Display Advertising"(PDF). Advanced Database Marketing: Innovative Methodologies & Applications for Managing Customer Relationships. Gower Publishing, London. ISBN978-1409444619. Diarsipkan dari versi asli(PDF) tanggal 23 August 2012. Diakses tanggal 20 June 2013.