The Question of Psychological Types: The Correspondence of C. G. Jung and Hans Schmid Guisan, 1915–1916. (2013). Edited by John Beebe and Ernst Falzeder. Princeton, NJ: Princeton University Press. … See original article here – The Question of Psychological Types: The Correspondence of C. G. Jung and Hans Schmid Guisan, 1915–1916. (2013). Edited by John Beebe and Ernst Falzeder. Princeton, NJ: Princeton University Press.