Johns Hopkins Coronavirus Resource Center [EB/OL]. (2021-01-01)[2021-05-31]. .
[3]
Bureau of Economic Analysis. Gross Domestic Product[EB/OL]. [2021-05-31]. .
[4]
WATSON A. Monthly retail sales of bookstores in the United States from January 2018 to January 2021[EB/OL].(2021-05-04)[2021-05-31]. .
[5]
WATSON A. Number of independent bookstores in the United States from 2009 to 2019[EB/OL].(2019-10-29)[2021-05-31]. .
[6]
WATSON A. Book store sales in the United States from 1992 to 2020[EB/OL].(2021-05-03)[2021-05-31]. .
[7]
艾媒数据中心. 1990—2020年美国通货膨胀率[EB/OL]. .
[8]
WATSON A. Average annual expenditure on books per consumer unit in the United States from 2007 to 2019[EB/OL].(2020-09-17)[2021-05-31]. .
[9]
WATSON A. Average annual expenditure on digital book readers per consumer unit in the United States from 2011 to 2019[EB/OL].(2020-09-16)[2021-05-31]. .
[10]
WATSON A. Audiobook sales revenue in the United States from 2009 to 2019[EB/OL].(2020-10-14)[2021-05-31]. .
[11]
WATSON A. Share of adults who have read a book in any format in the last 12 months in the United States from 2011 to 2019[EB/OL].(2021-05-07)[2021-05-31]. .
[12]
KUNST A. How many of your print books do you purchase in stores and how many online?[EB/OL].(2019-12-20)[2021-05-31]. .
[13]
The NPD Group. After a slow start, U.S. print book sales rose 8.2 percent in 2020[EB/OL].(2021-01-07)[2021-05-31]. .
[14]
WATSON A. Monthly retail sales of bookstores in the United States from January 2018 to October 2020[EB/OL].(2021-05-04)[2021-05-31]. .
[15]
Amazon’s earnings double as sales surge[EB/OL].(2020-07-30)[2021-05-31]. .
[16]
Americans for Tax Fairness. Net worth of U.S. billionaires has soared by $1 trillion—To total of $4 trillion—Since pandemic began [EB/OL]. (2020-07-30)[2021-05-31]. .