7《New paywall costs the Times 66% of its internetreadership》http : / / www.guardian.c o.uk /media/ 2010 /jul/18 /trams -paywall-readership.
8《The Times UK Lost 4 Million Readers To ItsPaywall Experiment》http://techcrunch.com/2010/11/O2/times -paywan-4- million-readers/.
9《What You Need to Know About the NewYork Times" Pay Wall》http://www.theadantic.com/technology/archive/2011 / 01/what -you -need -to -know -about -the -new -york - times-pay-wall/70113/.
10《New York Times Paywall Hangs On iPadApp》http://hothardware.com/News/New -York -Times - Paywall- Hangs- On-iPad-App /.
