@book{189745,
	author = {Poskitt, Kjartan and Postgate, Daniel and Cao, Fei},
	title = {Ni zhen de hui +-x÷ma = The essential arithmetricks how to +-x÷},
	publisher = {Beijing Juvenile and Children's Publishing House},
	year = {2010},
	series = {HORRIBLE SCIENCE},
	address = {Beijing}
}