@book{7152,
	author = {Copi, Irving M.},
	title = {Symbolic logic},
	publisher = {Pearson Education Publisher},
	year = {2016},
	address = {Noida},
	edition = {5th},
	url = {https://libgen.is/book/index.php?md5=CD594F7904267B7CD7368248930356AD}
}