Twenty years of Europe, the Engels-Lafargue correspondence 1868-1888 : a survey of volume 1 of the correspondence of Friedrich Engels, Laura Marx, and Paul Lafargue, FLPH, Moscow, 1959, with some supplementary material from volume 3 /
Kiernan, V. G.(Victor Gordon),1913-
Socialist History Society.
London : Socialist History Society,
2001.
Engels, Friedrich, 1820-1895.
Lafargue, Laura Marx, 1845-1911.
Lafargue, Paul, 1842-1911.
Socialism.