@book{81533,
	author = {Cupillari, Antonela and Cupillari, Antonella},
	title = {The nuts and bolts of proofs : an introduction to mathematical proofs (4th edition)},
	publisher = {Elsevier Academic Press},
	year = {2013},
	address = {Amsterdam ; Boston},
	edition = {4th edition},
	note = {Includes bibliographical references (p. 278-280) and index.}
}