@book{purtill_logical_1989,
	address = {Englewood Cliffs, N.J},
	title = {A {Logical} {Introduction} to {Philosophy}},
	isbn = {0-13-539917-3},
	publisher = {Prentice Hall},
	author = {Purtill, Richard L},
	year = {1989},
	keywords = {Introductions, Logic, Philosophy},
}

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