1. Reference1 Anastasi A. and Urbina S. (1977). Psychological testing
2. Reference2 2. Bekhterev V.M. (2010). Problems of development and education of man. (pp. 167–224). ISBN 978-5-89502-573-4
3. Reference3 3. Boldyreva S. I. (1974). Drawings of preschool children with schizophrenia.
4. Reference4 4. Burkitt, E. (2004) Drawing conclusions from children's art. PSYCHOLOGIST-LEICESTER, 17. (pp. 566-569).
5. Reference5 5. Cox M. V. (2013). Children's drawings of the human figure. Psychology Press.