Letter to Max Born, 4 Dec. 1926, in Einstein und Born Briefwechsel (1969) p. 130 (often quoted as Gott wrfelt nicht God does not play dice, e.g. in B. Hoffmann Albert Einstein (1973) ch. 10)
Albert Einstein (2015). “Bite-Size Einstein: Quotations on Just About Everything from the Greatest Mind of the Twentieth Century”, p.25, St. Martin's Press