Gw mau tau Lihat juga dari Friedrich Engels. Jelasin dalam bahasa melayu

The Marx & Engels Internet Archive at Marxists.org

Marx and Engels in their native German language

Works by Friedrich Engels (in German) at Zeno.org

Friedrich Engels, “On Rifled Cannon," articles from the New York Tribune, April, May and June, 1860, reprinted in Military Affairs 21, no. 4 (Winter 1957) ed. Morton Borden, 193-198.