00573naa#a2200169#i#450# EN\\bibl\6580 20240518215118.6 1999-5644 20150828b2015####ek#y0engy0150####ca RUS RU Model of education in the sphere of tourism as an invariant set of organizational-pedagogical conditions and principles Journal article CHERKIZOVO Russian State University of Tourism and Service 2015 7 с. Journal article local Sakharchuk Elena Sergeevna rguts.editorum.ru