@book{5928,
	author = {Sobel ,Max A.; Maletsky ,Evan M.},
	title = {Teaching Mathematics: a source book of aids, activites, and stategies},
	publisher = {Allyn and Bacon},
	year = {,1991.},
	address = {Boston:},
	edition = {2nd},
	note = {Includes Index}
}