1. Barr , D. 2016 St. Louis Symphony sees increased ticket revenue http://www.bizjournals.com/stlouis/news/2016/07/27/saint-louis-symphony-sees-increased-ticket-revenue.html
2. Bloom , E. 2014 No death knell: Pittsburgh symphony and opera strive to attract newcomers http://www.post-gazette.com/ae/music/2014/09/14/Pittsburgh-symphony-and-opera-strive-to-atract-newcomers/stories/201409140144
3. Borwick , Doug 2016 Are you getting enough bang for your buck? http://www.artsjournal.com/engage/2016/06/are-you-getting-enough-bang-for-your-buck/
4. Single serve or package deal? A study of regular attendees to symphony orchestra concerts;Boyle;International Journal of Nonprofit and Voluntary Sector Marketing,2007
5. Desai , Namita 2015 Reimaging the Orchestra Subscription Model: A study by Oliver Wyman, commissioned by the League of American Orchestras http://americanorchestras.org/knowledge-research-innovation/audience-engagement/reimagining-the-subscription-model.html