References
- K. Marx and F. Engels, Soch., 2nd ed., Vol. 1.
- L P. Pavlov, Poln. sobr. soch., Vol. III, Book 1, Moscow, USSR Academy of Sciences, 1951.
- K. M. Bykov, Doklady na nauchnoi sessii, posviashchennoi problemam fiziologicheskogo ucheniia I. P. Pavlova. Materialy nauchnoi sessii, Moscow, USSR Academy of Sciences, 1950.
- A. Ia. Kolodnaia, "Razvitie differentsirovki pravogo-levogo u detei doshkol'nogo vozrasta," Izvestiia APN RSFSR, No. 53.
- A. M. Leushina, Obuchenie schetu v detskom sadu, Moscow, Uchpedgiz, 1st ed., 1959; 2nd ed., 1961.
- A. M. Leushina, Zaniatiia po schetu v detskom sadu, Moscow, Uchpedgiz, 1963.