Rothstein, Andrew
Penguin Books , 1950
Buku Teks SO
Mongait, Alexander
Foreign Languages Publishing House, 1959
Buku Teks
edited by P.P Gureyev and P.I. Sedugin
Progress Publishers, 1977
Buku Teks SO
Munich : Institute for the Study of the USSR
Majalah, Jurnal, Buletin
by E. Zaleski ... [and others]
Organisation for Economic Cooperation and Development, 1969
Buku Teks SO