مراجع
- ^ "Trade catalogs from Chas. Pfizer & Co. Inc". National Museum of American History (بEnglish). مؤسسة سميثسونيان. Archived from the original on 2021-01-28. Retrieved 2020-11-18.
- ^ Vereinigung des Adels in Bayern e. V. (Hrsg.): Genealogisches Handbuch des in Bayern immatrikulierten Adels, Band XV, Neustadt an der Aisch 1984, p. 452.
- ^ [1] نسخة محفوظة May 10, 2017, على موقع واي باك مشين. "In 1849, a young German chemist, Charles Pfizer, and his cousin Charles Erhart, who had come to America seeking new opportunities, founded the business that bears the Pfizer name."