Those of Freud's letters to his fianceé Martha Bernays which have been published contain a few hints about the course of Pappenheim's therapy and Freud's relationship to Breuer, but until all of Freud's letters are published there is room for speculation.
Need Freudi kirjadest tema kihlatu Martha Bernaysile, mis on avaldatud, sisaldavad mõningaid vihjeid Pappenheimi teraapia kulust ja Freudi suhtest Breueriga, kuid enne, kui kõik Freudi kirjad avaldatakse, on ruumi igasuguseks spekuleerimiseks.