> Treat any claim without a URl as suspicious. This assumes that the web is the only information source you should be using as a reference. You definitely sho

> Treat any claim without a URl as suspicious. This assumes that the web is the only information source you should be using as a reference. You definitely should cite your sources if you can, but saying they have to be web soruces is a pretty limiting requirement. The tumblr page that gave the print citation did just fine.