1. Abraham Pais, “Subtle is the Lord”, 1982.
2. Banesh Hoffmann, “Albert Einstein creator and rebel”, 1972.
3. Ronald W. Clark, “Einstein: the life and times”, 1971.
4. https://www.nobelprize.org/
5. Barbara Wolff, https://www.einstein-website.de/z_information/nobelpreisgeld.html