Artikel Jurnal
Elster, Jon, author
Prestasi Pustakaraya, 2000
Buku Teks
Lenin, Vladimir I., author
Foreign Languages Publishing House, 1952
Buku Teks
Engels, Friedrich, 1820-1895, author
Hasta Mitra, 2002
Buku Teks
Lenin, Vladimir I., author
Foreign Languages Publishing House , 1950
Buku Teks