@book{105150,
	author = {Engels, Friedrich, and Marx, Karl,},
	title = {Der Briefwechsel zwischen Friedrich Engels und Karl Marx 1844 bis 1883, Erster Band},
	publisher = {Project Gutenberg,},
	year = {2021},
	address = {Salt Lake City, UT :},
	note = {Release date is 2021-01-18},
	url = {https://www.gutenberg.org/ebooks/64327}
}