Previous ed. of translation 1937. Originally published as 'Das Ich und die Abwehrmechanismen'. Wien (Vienna): Internationaler Psychoanalytischer Verlag, 1936.
The ego and the mechanisms of defence by Anna Freud. ISBN 0701201053. Published by Hogarth P. for the Institute of Psycho-Analysis in 1968. Publication and catalogue information, links to buy online and reader comments.