Marc,
Try searching the industry mags (Cleanfax, ICS Cleaning Specialists-both have online versions, or also the LMCCA site), carpet manufacturers may have some articles on the benefits of carpet (although we know they are in bed with HWE when it comes to cleaning), some of the manufacturers of cleaning products/equipment may have articles/info on their sites, and also just try typing what you want in Google and searching (sure you already tried this, but it still has to be said). Happy hunting.