INTELLEKTUAL'NO-INFORMATsIONNAYa PODDERZhKA DEYaTEL'NOSTI SPETsIALISTA PO SVYaZYaM S OBShchESTVENNOST'Yu - PDF (Russian)
Copyright (c) 1970 Mel'nik N.M., Nesterenko V.M.
This work is licensed under a Creative Commons Attribution 4.0 International License.