1. Alter A. Printer jam: serious supply issues disrupt the book industry’s fall season. The New York Times, August 27, 2020. https://www.nytimes.com/2020/08/27/books/printing-companies-backlog-book-publishing.html.
2. Anderson P. AAP StatShot: US trade book sales Up 9.7 percent for 2020. Publishing Perspectives, February 25, 2021. https://publishingperspectives.com/2021/02/aap-statshot-sees-us-trade-book-sales-up-9-7-percent-for-2020-covid19/.
3. Audio Publishers Association. Audiobooks continue their market rise with 16% growth in sales. Audio Publishers Association, June 18, 2020. https://www.audiopub.org/uploads/pdf/2020-Consumer-Survey-and-2019-Sales-Survey-Press-Release-FINAL.pdf.
4. Audio Publishers Association. Audiobook listening remains strong in 2020 as publishers report ninth straight year of double-digit growth. Audio Publishers Association, June 1, 2021. https://cdn.ymaws.com/audiopub.site-ym.com/resource/collection/63CA49A7-1450-449A-A718-8ACCA7250FF9/2021_Consumer_&_2020_Sales_Surveys_Press_Release.pdf.
5. Audio Publishers Association. New survey shows 50% of Americans have listened to an audiobook. Audio Publishers Association, April 24, 2019. https://www.audiopub.org/uploads/pdf/Consumer-Survey-Press-Release-2019-FINAL.pdf.