@book{223963,
	author = {YUSUF, Yasin and Umi Auliya},
	title = {Pertama di Indonesia Sirkuit Pintar melejitkan kemampuan matematika dan Bahasa Inggris dengan metode Ular Tangga},
	publisher = {Visimedia},
	year = {2011},
	address = {Jakarta},
	edition = {1}
}