6Larry Shannon-Missal.Power(ed) Readers :Americans Who Read More Electronically Read More,Period.The Harris Poll.37,April 17,2014.
二级参考文献6
1Borsenblatt.Wochenmagazin fur den Deutschen Buchhandel [Weekly magazine of the book trade in in Germany]. 177(2010), issue 35,2.9:18.
2Buch und Buchhandel in Zahlen [Books and book trade in numbers], Published by the German Booksellers As- sociation e. V. Frankfurt am Main 2010;8.
3Muller, Christina / Spiegel, Stefan / UIIrich, Franka: E-Books in Deutschland. Der Beginn einer neuen Gutenberg-? ra? Published by PricewaterhouseCoopers in September 2010.
4Roesler-Graichen, Michael: Hochrechnungen ohne Sicherheitsleine. In: B? rsenblatt. Wochenmagazin ftir den Deutschen Buchhandel [Weekly magazine of the book trade in Germany]. 177 (2010), issue 35, 2.9.35.
5Sambeth,Frank:E-Book-Markt USA Aktuelle Entwicklungen und Ausblick. Vortrag Publisher's Forum Berlin, 27. 4. 2010; based on data of the American Association of Publishers (AAP).