"{title}". Diarsipkan dari versi asli tanggal 2 July 2016. Diakses tanggal 23 June 2016.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Havas to buy 25.8% stake in CEP for $503.7 million". Wall Street Journal, Eastern edition; New York, N.Y. New York, N.Y., United States, New York, N.Y. 1997-01-17. hlm. –10:1. ISSN0099-9660. ProQuest398557623.
Carreyrou, John; Frank, Robert (2002-10-23). "Vivendi Universal Reaches Pact To Sell Part of Publishing Unit --- France's Lagardere Is Set To Buy Non-U.S. Portion; Criticism of Deal Is Likely". Wall Street Journal, Eastern edition; New York, N.Y. New York, N.Y., United States, New York, N.Y. hlm. –4. ISSN0099-9660. ProQuest398881177.
"{title}". Diarsipkan dari versi asli tanggal 2 July 2016. Diakses tanggal 23 June 2016.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Havas to buy 25.8% stake in CEP for $503.7 million". Wall Street Journal, Eastern edition; New York, N.Y. New York, N.Y., United States, New York, N.Y. 1997-01-17. hlm. –10:1. ISSN0099-9660. ProQuest398557623.
Carreyrou, John; Frank, Robert (2002-10-23). "Vivendi Universal Reaches Pact To Sell Part of Publishing Unit --- France's Lagardere Is Set To Buy Non-U.S. Portion; Criticism of Deal Is Likely". Wall Street Journal, Eastern edition; New York, N.Y. New York, N.Y., United States, New York, N.Y. hlm. –4. ISSN0099-9660. ProQuest398881177.