For citations:
Gendina N.I., Kolkova N.I., Ryabtseva L.N. Charged and free services in the libraries of the constituent entities of the Russian Federation within the theory of patronized goods. Scientific and Technical Libraries. 2023;(6):58-72. (In Russ.) https://doi.org/10.33186/1027-3689-2023-6-58-72