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You have a choice: Roof or back trunk racks.
http://www.yakima.com/Consumer/Step1.aspx
Well, depending whether you have the coupe, sedan or hatchback.
I was able to put a tandem bike roof rack on a Civic years ago. It looked funny because the rack was so long but it worked fine.
Yamima racks have the best array of options and attachments IMO. I've always used Yakima although I do prefer the Thule rack boxes.