I'll see if I can find some better ones. This was just the first one I plucked out of a random citation, because I knew I would get eviscerated without one. But I've been seeing the advice about disposables as far back as I can remember. It was even a trick question in an eco quiz when I was a child back in the 90s (i.e. "Which of these things are better ecological choices?").
Interestingly the 2006 study itself is an updated version. Disposables did even better in the 2006 study than in the older one: Due to advances in manufacturing and in materials science, they were able to start producing them using less material (which decreases the carbon footprint during manufacturing, shipping, and disposal).