@book{74421,
	author = {Krapivin, Vassily },
	title = {What is Dialectical Materialism ? /},
	publisher = {Progress Publishers, },
	year = {1987.},
	series = {ABC Of Social And Political Knowledge},
	address = {Moscow :},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B08-01674.pdf}
}