Progress Publishers, 1977
Buku Teks
Yevenko, Ivan Andreevich
Foreign Languages Publishing House , [1962]
Buku Teks
Sorokin, G
Progress Publisher, 1967
Buku Teks
Spulber, Nicolas
Indiana University Press, 1971
Buku Teks
Lewis, William Arthur, 1915-, author
Public Affairs, 1951
Buku Teks