Kamińska, A., and I. Pulak. “The Theoretical Basis for the Methodology of Comparative Research, Considered in the Light of the Contemporary Relevance of the Views of Prominent Comparative Educational Theorists”. Elementary Education in Theory and Practice, Vol. 9, no. 33/3, July 2016, pp. 11-24, doi:10.35765/eetp.2014.0933.01.