Psychotherapy, also known as talk therapy, was developed by Sigmund Freud in the late 19th and early 20th centuries. Freud's development of psychoanalysis laid the foundation for modern psychotherapy techniques and approaches.

Arnold W. Rachman has written:

'Identity group psychotherapy with adolescents' -- subject(s): Group psychotherapy, Group psychotherapy for teenagers, Identity (Psychology) in adolescence, In adolescence, Psychotherapy, Group

'Psychotherapy of Difficult Cases' -- subject(s): Psychotherapy

Psychotherapy Research was created in 1990.

There are a number of good schools for Psychotherapy training. Here are some links to help with your decision en.wikipedia.org/wiki/Psychotherapy, www.hypnotherapyuk.net/, bodypsychotherapys.com/psychotherapy-training/