1902-1987 1999b-729 2004d-323 2013d-931 adolescent adolescentpsychotherapy bibliografie child childdevelopment childpsychotherapy cliëntgerichtetherapie counseling humanisticpsychology mentaldisorders mentalillness methodology methods models nondirectivetherapy nonfiction person-centeredpsychotherapy philosophicaltheology philosophy preschool psychological psychologicalmodels psychologicaltheory psychology psychotherapie psychotherapists psychotherapy psychothérapie rj rogers studyandteaching therapistandpatient therapy trainingof ws105p4662003