References
- Kovalev, V. V. (1977) [Psychiatry of childhood (A handbook for physicians)]. Moscow: “Meditsina” Publishers. P. 10.
- Christozov C. (Ed.) (1983) [Psychiatry of childhood], Sofia: “Medicina i Fizkultura” Publishers.
- Pyriov, G. (1967) [Psychology of childhood]. Sofia: “Nauka i Izkustvo” Publishers. Pp. 66–78.
- [Methodological instructions for diagnosis of school maturity in children aged six to seven years before admission to primary school]. Sofia: HE1, 1982.
- Batoeva, D. (1983) [The adaptation of children to teaching]. Sofia: “Medicina i Fizkultura” Publishers. Pp. 78–80.