@book{62203,
	author = {Copi Irving M},
	title = {Introduction to logic},
	publisher = {Prentice Hall of India, },
	year = {c2002.},
	address = {New Delhi : },
	edition = {9th ed.},
	note = {Includes index.},
	url = {https://www.worldcat.org/title/introduction-to-logic/oclc/314468168&referer=brief_results}
}