Search with the keyword "bidirectional", then you will find what you are looking for. Although most of the items only are 1x2 / 2x1. But I found e.g. this. Disclaimer: no idea if this switch is any good.
Go return that book and get it on amazon if you don't pirate it. On amazon it's only $17 to rent: http://www.amazon.com/Brief-History-Chinese-Civilization/dp/0495913235/ref=sr_1_1?ie=UTF8&qid=1421847491&sr=8-1&keywords=a+brief+history+of+chinese+civilization