Wilfred R. Bion 
Transformations [PDF ebook] 

Transformations continues the investigation of various aspects of psychoanalytic theory and practice which Bion commenced with Learning from Experience (1962) and pursued in Elements of Psychoanalysis (1963). In this third work published in 1965, Bion examines the ways in which the analyst’s description of the original analytic experience, mediated by theory, necessarily transforms it in the course of effecting an interpretation.