参考资料
1.http://www.biodiscover.com/news/company/43000.html
2.http://www.workcaregroup.com/downloads/ForumSpS00.pdf
3.https://en.wikipedia.org/wiki/Edmund_T._Pratt_Jr.
4.https://en.wikipedia.org/wiki/Henry_McKinnell
5.https://en.wikipedia.org/wiki/Ian_Read
6.https://finance.yahoo.com/chart
7.https://fortune.com/fortune500/2019/pfizer
8.https://news.pharmacodia.com/web/informationMobileController/getMobileNewInformationById?id=8a2d9837612b05a10161382be3950448
9.https://www.bloomberg.com/profile/person/18495385
10.https://www.drugwatch.com/manufacturers/pfizer
11.https://www.fool.com/investing/2019/04/14/the-3-greatest-risks-pfizer-faces.aspx
12.https://www.forbes.com/companies/pfizer/#672e427f2d6b
13.https://www.pfizer.com/about/history/all
14.https://www.pfizer.com/news/press-release/press-release-detail/ian_read_to_retire_as_executive_chairman_of_pfizer_s_board_of_directors_chief_executive_officer_dr_albert_bourla_named_chairman
15.https://www.pfizer.com/science/drug-product-pipeline
16.https://www.proclinical.com/blogs/2019-3/the-top-10-pharmaceutical-companies-in-the-world-2019
17.https://www.rankingthebrands.com/Brand-detail.aspx?brandID=1047
18.https://www.statista.com/statistics/264827/pfizers-worldwide-viagra-revenue-since-2003
19.https://www.thepharmaletter.com/article/all-change-at-pfizer-as-new-ceo-shakes-up-leadership-team
20.https://www.thepharmaletter.com/article/pfizer-current-difficulties-and-future-challenges-as-seen-by-visiongain