【作者(必填)】Dave Wooldridge,Michael Schneider

【文题(必填)】Exploring the Freemium Model with In-App Purchase

【年份(必填)】The Business of iPhone and iPad App Development 2011, pp 207-251

【全文链接或数据库名称(选填)】http://link.springer.com/chapter/10.1007/978-1-4302-3301-5_8