1. Boring, E.G. (1957). A history of experimental psychology (2nd ed.). New York: Appleton-Century-Crofts.
2. Bubnov, A. (1936). Vosstanovit' polnostiu v pravakh pedagogiku i pedagogov [For the complete restoration of the duties of pedagogy and pedagogs]. Pod Znamenem Marksizma, No. 10, 28?62.
3. Dolin, A.O. (1967). Moi vstrechi s I.P. Pavlovym i rabota u nego [My meetings with I.P. Pavlov and my work under his direction]. In E.M. Kreps (Ed.). I.P. Pavlov v vospominaniakh sovremennikov (pp. 79?96). Leningrad: Izdatel'stvo ?Nauka.?
4. Duncker, K. (1935). Lernen und Einsicht im Dienst der Zielerreichungen [Learning and insight in the service of the goal-attainments]. Acta Psychologica. Hague, 1, 77?82.
5. Geshtaltpsikhologiia [Gestalt psychology], (1952). In B.A. Vvedenskii (Ed.). Bolshaia sovetskaia entsiklopedia (2nd edition, Vol 11, p. 192). Moskva: Gosudarstvennoe Nauchnoe Izdatel'stvo ?Bolshaia Sovetskaia Entsiklopedia.?