@book{59147,
	author = {Rivera, Derdinand.},
	title = {Math challenges :},
	publisher = {Basic Media Systems,},
	year = {c1998.},
	address = {Makati City :},
	note = {Contents. -- v.1. Freshman. -- v.2. Sophomore. - v.3. Junior. -- v.4. Senior.}
}