Niels Bohr's response to questions on the nature of language during his first meeting with Werner Heisenberg (Summer 1920), as quoted in "Discussions about Language", 1933, in Robert J. Pranger "Defense Implications of International Indeterminacy" (p. 11), 1972, and in Steve Giles "Theorizing Modernism: Essays in Critical Theory" (p. 28), 1993.
Abigail Adams, John Adams, L. H. Butterfield, Marc Friedlaender, Mary-Jo Kline (1975). “The Book of Abigail and John: Selected Letters of the Adams Family, 1762-1784”, p.80, UPNE