Freud, Sigmund, 1856-1939. Hubback, C. J. M., tr. Herman Finkelstein Collection (Library of Congress) DLC text New York, Boni and Liveright [1924] eng Printed in Austria. Pleasure principle (Psychology) Psychoanalysis. Also available in digital form. https://hdl.loc.gov/loc.gdc/gdcscd.00035752547