61. 出典 P4 Photo of SoftBook by jurvetson at Flickr(http://www.flickr.com/photos/ 44124348109@N01/2608962510/in/photolist-4YxBEf) under CC BY 2.0 License Photo of Rocket eBook (http://www.est.co.jp/ks/dish/rocket/rocket.htm) P6 Photo of PRS-500 by Hidae under Creative Commons Attribution-Share Alike 3.0 Unported license P7/P8 iPod photo by Rjcflyer@aol.com under CC-BY-2.5. P7/P8 Bezos photo by by jur
