@book{14950,
	author = {Gayon, Edwehna Elinore P., and Punzalan, Anekua E.,},
	title = {Our changing environment /},
	publisher = {DIWA LEARNING SYSTEMS INC.,},
	year = {c2011.},
	address = {Makati City, Philippines :},
	edition = {Second Edition.}
}