Einstein: His Life and Universe

, Feb. 6, 1916.

9

. Einstein to Mileva Mari

, Mar. 12, Apr. 1, 1916; Neffe, 194.

10

. Einstein to Mileva Mari

, Apr. 1 and 8, 1916; Einstein to Michele Besso, Apr. 6, 1916; Michele Besso to Heinrich Zangger, Apr. 12, 1916, CPAE 8: 211 (German edition), footnote 2.

11

. Einstein to Elsa Einstein, Apr. 12 and 15, 1916. See also Einstein to Elsa Einstein, Apr. 10, 1916, in the sealed family correspondence released in 2006, CPAE 8: 211a: “My relationship with him is becoming very warm.”

12

. Einstein to Elsa Einstein, Apr. 21, 1916. See also Einstein to Heinrich Zangger, July 11, 1916: “Following an exceedingly nice Easter excursion, the subsequent days in Zurich brought on a complete chilling in a way that is not quite explicable to me.”

13

. Einstein to Heinrich Zangger, July 11, 1916; Einstein to Michele Besso, July 14, 1916. See CPAE 8: 233 (German edition), footnote 4, for Zangger being the other person referred to in the letter.

14

. Pauline Einstein to Elsa Einstein, Aug. 6, 1916, in Overbye, 301.

15

. Einstein to Michele Besso, July 14, 1916; Michele Besso to Einstein, July 17, 1916; CPAE 8: 239 (German version), footnote 2.

16

. Einstein to Michele Besso, July 21, 1916, two letters.

17

. CPAE 8: 241 (German edition), footnotes 3, 4; Einstein to Heinrich Zangger, July 25, 1916; Heinrich Zangger to Michele Besso, July 31, 1916.

18

. Einstein to Heinrich Zangger, Aug. 18, 1916; Einstein to Hans Albert Einstein, July 25, 1916. See also Einstein to Heinrich Zangger, Mar. 10, 1917.

19

. Einstein to Michele Besso, Aug. 24, 1916; Einstein to Hans Albert Einstein, Sept. 26, 1916.

20

. Hans Albert Einstein to Einstein, before Nov. 26, 1916.

21

. Einstein to Michele Besso, Oct. 31, 1916.

22

. Einstein to Helene Savi

, Sept. 8, 1916.

23

. Einstein, “The Foundation of the General Theory of Relativity,” Mar. 20, 1916, CPAE 6: 30.

24

. Einstein,

On the Special and the General Theory of Relativity

, Dec. 1916, CPAE 6: 42, and many popular editions; Michelmore, 63. For an Internet version of Einstein’s book, see bartleby.com/173/or www.gutenberg.org/etext/5001.

25

. Einstein, “Principles of Research,” 1918, in Einstein 1954, 224.

26

. Einstein to Heinrich Zangger, Jan. 16, 1917; Clark, 241.