Internat︠s︡ionalʹnye nauchnye i kulʹturnye svi︠a︡zi Sovetskogo Soi︠u︡za, 1928-1932 /
Ioffe, A. E.(Aleksandr Evseevich)
Moskva :  Akademii︠a︡ Nauk SSSR. Institut Istorii SSSR,
1969.
Cultural relations.