@book{199207,
	author = {CAYNE, Bernad S. and Sabrony Rachmadie},
	title = {Ilmu Pengetahuan Populer Jilid 4 : Ilmu Pengetahuan Lingkungan - Ilmu Kimia - Ilmu Fisika},
	publisher = {Grolier International-Widyadara},
	year = {2005},
	address = {Jakarta}
}