The Twin Earth BIBLIOGRAPHY Ben-Menahem, Yemima. (27 July 2019). Hilary Putnam, Encyclopædia Britannica, Encyclopædia Britannica, Inc., https://www.britannica.com/biography/Hilary-Putnam. Putnam, Hilary. (19 August 1973). Meaning and Reference, The Journal of Philosophy, vol. 70, p. 691711.